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  • 1. Ben Romdhane, Ferdaous
    et al.
    Cretu, Ovidiu
    Debbichi, Lamjed
    Eriksson, Olle
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Lebegue, Sebastien
    Banhart, Florian
    Quasi-2D Cu2S Crystals on Graphene: In-situ Growth and ab-initio Calculations2015Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 11, nr 11, s. 1253-1257Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Two-dimensional crystals of beta-copper sulfide are synthesized in an in-situ electron microscopy experiment. Copper crystals are deposited on an amorphous carbon film containing sulfur. The carbon film graphitizes upon heating and electron irradiation and allows the reaction of Cu and S towards two-dimensional Cu2S crystals. These are energetically favourable and bonded via van der Waals interactions to the graphitic substrate.

  • 2. Frykholm, Karolin
    et al.
    Alizadehheidari, Mohammadreza
    Fritzsche, Joachim
    Wigenius, Jens
    Modesti, Mauro
    Persson, Fredrik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för cell- och molekylärbiologi, Beräknings- och systembiologi.
    Westerlund, Fredrik
    Probing Physical Properties of a DNA- Protein Complex Using Nanofluidic Channels2014Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 10, nr 5, s. 884-887Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A method to investigate physical properties of a DNA-protein complex in solution is demonstrated. By using tapered nanochannels and lipid passivation the persistence length of a RecA filament formed on double-stranded DNA is determined to 1.15 μm, in agreement with the literature, without attaching protein or DNA to any handles or surfaces.

  • 3.
    Imani, Roghayeh
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi. Leibniz Univ Hannover, Inst Tech Chem, Callinstr 3, D-30167 Hannover, Germany.;Univ Ljubljana, Fac Elect Engn, Biophys Lab, SI-1000 Ljubljana, Slovenia..
    Dillert, Ralf
    Leibniz Univ Hannover, Inst Tech Chem, Callinstr 3, D-30167 Hannover, Germany.;Leibniz Univ Hannover, Lab Nano & Quantum Engn, Schneiderberg 39, D-30167 Hannover, Germany..
    Bahnemann, Detlef W.
    Leibniz Univ Hannover, Inst Tech Chem, Callinstr 3, D-30167 Hannover, Germany.;St Petersburg State Univ, Lab Photoact Nanocomposite Mat, St Petersburg 198504, Russia..
    Pazoki, Meysam
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Apih, Tomaz
    Jozef Stefan Inst, Jamova 39, SI-1000 Ljubljana, Slovenia..
    Kononenko, Veno
    Univ Ljubljana, Dept Biol, Biotech Fac, Vecna Pot 111, SI-1000 Ljubljana, Slovenia..
    Repar, Neza
    Univ Ljubljana, Dept Biol, Biotech Fac, Vecna Pot 111, SI-1000 Ljubljana, Slovenia..
    Kralj-Iglic, Veronika
    Univ Ljubljana, Fac Hlth Sci, Biophys Lab, SI-1000 Ljubljana, Slovenia..
    Boschloo, Gerrit
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Fysikalisk kemi.
    Drobne, Damjana
    Univ Ljubljana, Dept Biol, Biotech Fac, Vecna Pot 111, SI-1000 Ljubljana, Slovenia..
    Edvinsson, Tomas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Iglic, Ales
    Univ Ljubljana, Fac Elect Engn, Biophys Lab, SI-1000 Ljubljana, Slovenia..
    Multifunctional Gadolinium-Doped Mesoporous TiO2 Nanobeads: Photoluminescence, Enhanced Spin Relaxation, and Reactive Oxygen Species Photogeneration, Beneficial for Cancer Diagnosis and Treatment2017Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 13, nr 20, artikel-id 1700349Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Materials with controllable multifunctional abilities for optical imaging (OI) and magnetic resonant imaging (MRI) that also can be used in photodynamic therapy are very interesting for future applications. Mesoporous TiO2 sub-micrometer particles are doped with gadolinium to improve photoluminescence functionality and spin relaxation for MRI, with the added benefit of enhanced generation of reactive oxygen species (ROS). The Gd-doped TiO2 exhibits red emission at 637 nm that is beneficial for OI and significantly improves MRI relaxation times, with a beneficial decrease in spin-lattice and spin-spin relaxation times. Density functional theory calculations show that Gd3+ ions introduce impurity energy levels inside the bandgap of anatase TiO2, and also create dipoles that are beneficial for charge separation and decreased electron-hole recombination in the doped lattice. The Gd-doped TiO2 nanobeads (NBs) show enhanced ability for ROS monitored via center dot OH radical photogeneration, in comparison with undoped TiO2 nanobeads and TiO2 P25, for Gd-doping up to 10%. Cellular internalization and biocompatibility of TiO2@xGd NBs are tested in vitro on MG-63 human osteosarcoma cells, showing full biocompatibility. After photoactivation of the particles, anticancer trace by means of ROS photogeneration is observed just after 3 min irradiation.

  • 4.
    Jobs, Magnus
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Hjort, Klas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Mikrosystemteknik.
    Rydberg, Anders
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Wu, Zhigang
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Mikrosystemteknik.
    A Tunable Spherical Cap Microfluidic Electrically Small Antenna2013Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 9, nr 19, s. 3230-3234Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We present a novel microfluidic three-dimensional elec- trically small antenna (ESA). It is easy to construct simply by pneumatically inflating a planar stretchable liquid alloy microfluidic antenna into a spherical cap. Its center frequency is tuned when it is inflated; demonstrating combined high efficiency and a wide tunable frequency range around its hemispherical shape.

  • 5. Nan, Wang
    et al.
    Samani, Majid Kabiri
    Li, Hu
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Dong, Lan
    Zhang, Zhongwei
    Su, Peng
    Chen, Shujing
    Chen, Jie
    Huang, Shirong
    Yuan, Guangjie
    Xu, Xiangfan
    Li, Baowen
    Leifer, Klaus
    Ye, Lilei
    Liu, Johan
    Large-area free-standing and ultrathin graphene films with superior thermal conductivity2018Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829Artikel i tidskrift (Refereegranskat)
  • 6.
    Pan, Ruijun
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Xu, Xingxing
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Sun, Rui
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
    Wang, Zhaohui
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Lindh, Jonas
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
    Edström, Kristina
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Strukturkemi.
    Strömme, Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
    Nyholm, Leif
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi.
    Nanocellulose Modified Polyethylene Separators for Lithium Metal Batteries2018Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, nr 21, artikel-id 1704371Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Abstract Poor cycling stability and safety concerns regarding lithium (Li) metal anodes are two major issues preventing the commercialization of high‐energy density Li metal‐based batteries. Herein, a novel tri‐layer separator design that significantly enhances the cycling stability and safety of Li metal‐based batteries is presented. A thin, thermally stable, flexible, and hydrophilic cellulose nanofiber layer, produced using a straightforward paper‐making process, is directly laminated on each side of a plasma‐treated polyethylene (PE) separator. The 2.5 µm thick, mesoporous (≈20 nm average pore size) cellulose nanofiber layer stabilizes the Li metal anodes by generating a uniform Li+ flux toward the electrode through its homogenous nanochannels, leading to improved cycling stability. As the tri‐layer separator maintains its dimensional stability even at 200 °C when the internal PE layer is melted and blocks the ion transport through the separator, the separator also provides an effective thermal shutdown function. The present nanocellulose‐based tri‐layer separator design thus significantly facilitates the realization of high‐energy density Li metal‐based batteries.

  • 7.
    Pedersen, Christian
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material. Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Farmaceutiska fakulteten, Institutionen för farmaci.
    Vallhov, Helen
    Karolinska Institutet.
    Engqvist, Håkan
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Scheynius, Annika
    Karolinska Institutet.
    Strømme, Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
    Nanoscale Size Control of Protein Aggregates2013Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 9, nr 19, s. 3320-3326Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Herein, a novel method to synthesize soluble, sub-micrometer sized protein aggregates is demonstrated by mixing native and denatured proteins without using bacteria and contaminating proteins. Ovalbumin (OVA) is employed as a model protein. The average size of the formed aggregates can be controlled by adjusting the fraction of denatured protein in the sample and it is possible to make unimodal size distributions of protein aggregates. OVA aggregates with a size of ∼95 nm are found to be more immunogenic compared to native OVA in a murine splenocyte proliferation assay. These results suggest that the novel method of engineering size specific sub-micrometer sized aggregates may constitute a potential route to increasing the efficacy of protein vaccines. The protein aggregates may also be promising for use in other applications including the surface functionalization of biomaterials and as industrial catalysis materials.

  • 8.
    Wang, Nan
    et al.
    Chalmers Univ Technol, Dept Microtechnol & Nanosci MC2, EMSL, Kemivagen 9, SE-41296 Gothenburg, Sweden.
    Samani, Majid Kabiri
    Chalmers Univ Technol, Dept Microtechnol & Nanosci MC2, EMSL, Kemivagen 9, SE-41296 Gothenburg, Sweden.
    Li, Hu
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Dong, Lan
    Tongji Univ, Ctr Phonon & Thermal Energy Sci, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China;Tongji Univ, Inst Adv Study, Shanghai 200092, Peoples R China.
    Zhang, Zhongwei
    Tongji Univ, Ctr Phonon & Thermal Energy Sci, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China;Tongji Univ, Inst Adv Study, Shanghai 200092, Peoples R China.
    Su, Peng
    Chalmers Univ Technol, Dept Microtechnol & Nanosci MC2, EMSL, Kemivagen 9, SE-41296 Gothenburg, Sweden.
    Chen, Shujing
    Shanghai Univ, SMIT Ctr, Sch Automat & Mech Engn, 20 Changzhong Rd, Shanghai 201800, Peoples R China.
    Chen, Jie
    Tongji Univ, Ctr Phonon & Thermal Energy Sci, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China;Tongji Univ, Inst Adv Study, Shanghai 200092, Peoples R China.
    Huang, Shirong
    Shanghai Univ, SMIT Ctr, Sch Automat & Mech Engn, 20 Changzhong Rd, Shanghai 201800, Peoples R China.
    Yuan, Guangjie
    Shanghai Univ, SMIT Ctr, Sch Automat & Mech Engn, 20 Changzhong Rd, Shanghai 201800, Peoples R China.
    Xu, Xiangfan
    Tongji Univ, Ctr Phonon & Thermal Energy Sci, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China;Tongji Univ, Inst Adv Study, Shanghai 200092, Peoples R China.
    Li, Baowen
    Univ Colorado, Dept Mech Engn, Boulder, CO 80309 USA.
    Leifer, Klaus
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad materialvetenskap.
    Ye, Lilei
    SHT Smart High Tech AB, Hugo Grauers Gata 3B, SE-41133 Gothenburg, Sweden.
    Liu, Johan
    Chalmers Univ Technol, Dept Microtechnol & Nanosci MC2, EMSL, Kemivagen 9, SE-41296 Gothenburg, Sweden;Shanghai Univ, SMIT Ctr, Sch Automat & Mech Engn, 20 Changzhong Rd, Shanghai 201800, Peoples R China.
    Tailoring the Thermal and Mechanical Properties of Graphene Film by Structural Engineering2018Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, nr 29, artikel-id 1801346Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Due to substantial phonon scattering induced by various structural defects, the in-plane thermal conductivity (K) of graphene films (GFs) is still inferior to the commercial pyrolytic graphite sheet (PGS). Here, the problem is solved by engineering the structures of GFs in the aspects of grain size, film alignment, and thickness, and interlayer binding energy. The maximum K of GFs reaches to 3200 W m(-1) K-1 and outperforms PGS by 60%. The superior K of GFs is strongly related to its large and intact grains, which are over four times larger than the best PGS. The large smooth features about 11 mu m and good layer alignment of GFs also benefit on reducing phonon scattering induced by wrinkles/defects. In addition, the presence of substantial turbostratic-stacking graphene is found up to 37% in thin GFs. The lacking of order in turbostratic-stacking graphene leads to very weak interlayer binding energy, which can significantly decrease the phonon interfacial scattering. The GFs also demonstrate excellent flexibility and high tensile strength, which is about three times higher than PGS. Therefore, GFs with optimized structures and properties show great potentials in thermal management of form-factor-driven electronics and other high-power-driven systems.

  • 9.
    Zhang, Youwei
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik. Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Zheng, Hemei
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Wang, Qiyuan
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Cong, Chunxiao
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Hu, Laigui
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Tian, Pengfei
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Liu, Ran
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Zhang, Shi-Li
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets elektronik.
    Qiu, Zhi-Jun
    Fudan Univ, Sch Informat Sci & Technol, State Key Lab ASIC & Syst, Shanghai 200433, Peoples R China.
    Competing Mechanisms for Photocurrent Induced at the Monolayer-Multilayer Graphene Junction2018Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 14, nr 24, artikel-id 1800691Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Graphene is characterized by demonstrated unique properties for potential novel applications in photodetection operated in the frequency range from ultraviolet to terahertz. To date, detailed work on identifying the origin of photoresponse in graphene is still ongoing. Here, scanning photocurrent microscopy to explore the nature of photocurrent generated at the monolayer-multilayer graphene junction is employed. It is found that the contributing photocurrent mechanism relies on the mismatch of the Dirac points between the monolayer and multilayer graphene. For overlapping Dirac points, only photothermoelectric effect (PTE) is observed at the junction. When they do not coincide, a different photocurrent due to photovoltaic effect (PVE) appears and becomes more pronounced with larger separation of the Dirac points. While only PTE is reported for a monolayer-bilayer graphene junction in the literature, this work confirms the coexistence of PTE and PVE, thereby extending the understanding of photocurrent in graphene-based heterojunctions.

  • 10.
    Zhou, Yu
    et al.
    Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA;Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Pondick, Joshua, V
    Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA;Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Silva, Jose Luis
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Woods, John M.
    Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA;Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Hynek, David J.
    Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA;Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Matthews, Grace
    North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA.
    Shen, Xin
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA;Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06511 USA.
    Feng, Qingliang
    Northwestern Polytech Univ, Sch Sci, Shaanxi Key Lab Opt Informat Technol, Xian 710072, Shaanxi, Peoples R China.
    Liu, Wen
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Lu, Zhixing
    Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA;Tsinghua Univ, Dept Chem, Beijing 10084, Peoples R China.
    Liang, Zhixiu
    Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
    Brena, Barbara
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Cai, Zhao
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA;Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA.
    Wu, Min
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA;Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA.
    Jiao, Liying
    Tsinghua Univ, Dept Chem, Beijing 10084, Peoples R China.
    Hu, Shu
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA;Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06511 USA.
    Wang, Hailiang
    Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA;Yale Univ, Dept Chem, 225 Prospect St, New Haven, CT 06511 USA.
    Araujo, Carlos Moyses
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Materialteori.
    Cha, Judy J.
    Yale Univ, Dept Mech Engn & Mat Sci, New Haven, CT 06511 USA;Energy Sci Inst, Yale West Campus, West Haven, CT 06525 USA.
    Unveiling the Interfacial Effects for Enhanced Hydrogen Evolution Reaction on MoS2/WTe2 Hybrid Structures2019Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 15, nr 19, artikel-id 1900078Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Using the MoS2-WTe2 heterostructure as a model system combined with electrochemical microreactors and density function theory calculations, it is shown that heterostructured contacts enhance the hydrogen evolution reaction (HER) activity of monolayer MoS2. Two possible mechanisms are suggested to explain this enhancement: efficient charge injection through large-area heterojunctions between MoS2 and WTe2 and effective screening of mirror charges due to the semimetallic nature of WTe2. The dielectric screening effect is proven minor, probed by measuring the HER activity of monolayer MoS2 on various support substrates with dielectric constants ranging from 4 to 300. Thus, the enhanced HER is attributed to the increased charge injection into MoS2 through large-area heterojunctions. Based on this understanding, a MoS2/WTe2 hybrid catalyst is fabricated with an HER overpotential of -140 mV at 10 mA cm(-2), a Tafel slope of 40 mV dec(-1), and long stability. These results demonstrate the importance of interfacial design in transition metal dichalcogenide HER catalysts. The microreactor platform presents an unambiguous approach to probe interfacial effects in various electrocatalytic reactions.

  • 11. Österberg, Frederik W
    et al.
    Rizzi, Giovanni
    Donolato, Marco
    Bejhed, Rebecca Stjernberg
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Mezger, Anja
    Strömberg, Mattias
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Nilsson, Mats
    Science for Life Laboratory, Department of Biochemistry and Biophysics, Stockholm University, Solna, Sweden.
    Strömme, Maria
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Nanoteknologi och funktionella material.
    Svedlindh, Peter
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Fasta tillståndets fysik.
    Hansen, Mikkel F
    On-Chip Detection of Rolling Circle Amplified DNA Molecules from Bacillus Globigii Spores and Vibrio Cholerae2014Ingår i: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 10, nr 14, s. 2877-2882Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    For the first time DNA coils formed by rolling circle amplification are quantified on-chip by Brownian relaxation measurements on magnetic nanobeads using a magnetoresistive sensor. No external magnetic fields are required besides the magnetic field arising from the current through the sensor, which makes the setup very compact. Limits of detection down to 500 Bacillus globigii spores and 2 pM of Vibrio cholerae are demonstrated, which are on the same order of magnitude or lower than those achieved previously using a commercial macro-scale AC susceptometer. The chip-based readout is an important step towards the realization of field tests based on rolling circle amplification molecular analyses.

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