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Zhang, S-L
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Publications (10 of 110) Show all publications
Zhang, Z.-l., Skovsted, C. B. & Zhang, Z.-f. (2018). A hyolithid without helens preserving the oldest hyolith muscle scars; palaeobiology of Paramicrocornus from the Shujingtuo Formation (Cambrian Series 2) of South China. Palaeogeography, Palaeoclimatology, Palaeoecology, 489, 1-14
Open this publication in new window or tab >>A hyolithid without helens preserving the oldest hyolith muscle scars; palaeobiology of Paramicrocornus from the Shujingtuo Formation (Cambrian Series 2) of South China
2018 (English)In: Palaeogeography, Palaeoclimatology, Palaeoecology, ISSN 0031-0182, E-ISSN 1872-616X, Vol. 489, p. 1-14Article in journal (Refereed) Published
Abstract [en]

The hyolithid Paramicrocornus zhenbaensis from the lower Cambrian (Cambrian Series 2) Shuijingtuo Formation of southern Shaanxi and western Hubei provinces of the Yangtze Platform is well-preserved in three dimensions. The morphology of the conch and operculum of P.zhenbaensis shows that this species lacked helens, which are considered to be characteristic of hyolithids and hence Paramicrocornus may belong to a sister group of other hyolithids. The shell structure of P.zhenbaensis reveals close similarities to the shell structure of other hyolithids. Furthermore, the smaller size and non-radial orientation of tubules in the shell structure of the operculum also differ from that in orthothecid hyoliths, suggesting that this characteristic may be used to differentiate hyolithids and orthothecids. The phosphatized opercula of P. zhenbaensis exhibit a pair of muscle scars located close to the apex of the internal surface. These muscle scars, as well as similar structures in other hyolithids, probably served as attachment sites of muscles controlling the retraction of the tentaculate feeding organ recently discovered in hyolithids. Without helens, P. zhenbaensis may have been sessile with the conch partly buried in the sea floor. (C) 2017 Published by Elsevier B.V.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keyword
Operculum, Hyolithida, Tentaculate feeding organ, Functional morphology, Shell structure, Yangtze Platform
National Category
Geology
Identifiers
urn:nbn:se:uu:diva-343551 (URN)10.1016/j.palaeo.2017.07.021 (DOI)000416501000001 ()
Funder
Swedish Research Council, VR2016-04610
Available from: 2018-03-06 Created: 2018-03-06 Last updated: 2018-03-06Bibliographically approved
Banerjee, D., Vallin, Ö., Samani, K. M., Majee, S., Zhang, S.-L., Liu, J. & Zhang, Z.-B. (2018). Elevated thermoelectric figure of merit of n-type amorphous silicon by efficient electrical doping process. Nano Energy, 44, 89-94
Open this publication in new window or tab >>Elevated thermoelectric figure of merit of n-type amorphous silicon by efficient electrical doping process
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 44, p. 89-94Article in journal (Refereed) Published
Abstract [en]

The currently dominant thermoelectric (TE) materials used in low to medium temperature range contain Tellurium that is rare and mild-toxic. Silicon is earth abundant and environment friendly, but it is characterized by a poor TE efficiency with a low figure of merit, ZT. In this work, we report that ZT of amorphous silicon (a-Si) thin films can be enhanced by 7 orders of magnitude, reaching similar to 0.64 +/- 0.13 at room temperature, by means of arsenic ion implantation followed by low-temperature dopant activation. The dopant introduction employed represents a highly controllable doping technique used in standard silicon technology. It is found that the significant enhancement of ZT achieved is primarily due to a significant improvement of electrical conductivity by doping without crystallization so as to maintain the thermal conductivity and Seebeck coefficient at the level determined by the amorphous state of the silicon films. Our results open up a new route towards enabling a-Si as a prominent TE material for cost-efficient and environment-friendly TE applications at room temperature.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2018
Keyword
Thermoelectrics, Amorphous silicon, Electrical conductivity, Electrical doping, Energy harvesting
National Category
Materials Engineering
Identifiers
urn:nbn:se:uu:diva-341565 (URN)10.1016/j.nanoen.2017.11.060 (DOI)000419833900011 ()
Funder
Swedish Research Council, 621-2014-5596Swedish Foundation for Strategic Research , SE13-0061
Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2018-02-27Bibliographically approved
Jablonka, L., Riekehr, L., Zhang, Z., Zhang, S.-L. & Kubart, T. (2018). Highly conductive ultrathin Co films by high-power impulse magnetron sputtering. Applied Physics Letters, 112(4), Article ID 043103.
Open this publication in new window or tab >>Highly conductive ultrathin Co films by high-power impulse magnetron sputtering
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2018 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 112, no 4, article id 043103Article in journal (Refereed) Published
Abstract [en]

Ultrathin Co films deposited on SiO2 with conductivities exceeding that of Cu are demonstrated. Ionized deposition implemented by high-power impulse magnetron sputtering (HiPIMS) is shown to result in smooth films with large grains and low resistivities, namely, 14 mu Omega cm at a thickness of 40 nm, which is close to the bulk value of Co. Even at a thickness of only 6 nm, a resistivity of 35 mu Omega cm is obtained. The improved film quality is attributed to a higher nucleation density in the Co-ion dominated plasma in HiPIMS. In particular, the pulsed nature of the Co flux as well as shallow ion implantation of Co into SiO2 can increase the nucleation density. Adatom diffusion is further enhanced in the ionized process, resulting in a dense microstructure. These results are in contrast to Co deposited by conventional direct current magnetron sputtering where the conductivity is reduced due to smaller grains, voids, rougher interfaces, and Ar incorporation. The resistivity of the HiPIMS films is shown to be in accordance with models by Mayadas-Shatzkes and Sondheimer which consider grain-boundary and surface-scattering.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2018
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-340315 (URN)10.1063/1.5011109 (DOI)000423724300039 ()
Funder
Swedish Foundation for Strategic Research , SE13-0033Swedish Foundation for Strategic Research , RIF14-0053Swedish Research Council, C0514401
Available from: 2018-01-29 Created: 2018-01-29 Last updated: 2018-04-04Bibliographically approved
Ahlberg, P., Hinnemo, M., Zhang, S.-L. & Olsson, J. (2018). Interface Dependent Effective Mobility in Graphene Field Effect Transistors. Journal of Electronic Materials, 47(3), 1757-1761
Open this publication in new window or tab >>Interface Dependent Effective Mobility in Graphene Field Effect Transistors
2018 (English)In: Journal of Electronic Materials, ISSN 0361-5235, E-ISSN 1543-186X, Vol. 47, no 3, p. 1757-1761Article in journal (Refereed) Published
Abstract [en]

By pretreating the substrate of a graphene field-effect transistor (G-FET), a stable unipolar transfer characteristic, instead of the typical V-shape ambipolar behavior, has been demonstrated. This behavior is achieved through functionalization of the SiO2/Si substrate that changes the SiO2 surface from hydrophilic to hydrophobic, in combination with postdeposition of an Al2O3 film by atomic layer deposition (ALD). Consequently, the back-gated G-FET is found to have increased apparent hole mobility and suppressed apparent electron mobility. Furthermore, with addition of a top-gate electrode, the G-FET is in a double-gate configuration with independent top- or back-gate control. The observed difference in mobility is shown to also be dependent on the top-gate bias, with more pronounced effect at higher electric field. Thus, the combination of top and bottom gates allows control of the G-FET's electron and hole mobilities, i.e., of the transfer behavior. Based on these observations, it is proposed that polar ligands are introduced during the ALD step and, depending on their polarization, result in an apparent increase of the effective hole mobility and an apparent suppressed effective electron mobility.

National Category
Engineering and Technology Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Electronics
Identifiers
urn:nbn:se:uu:diva-284924 (URN)10.1007/s11664-017-6023-6 (DOI)000424341700002 ()
Funder
Knut and Alice Wallenberg Foundation, 2011.0082Swedish Research Council, 2014-5591
Available from: 2016-04-19 Created: 2016-04-19 Last updated: 2018-04-11Bibliographically approved
Zhao, J., Song, M., Wen, C., Majee, S., Yang, D., Wu, B., . . . Zhang, Z.-B. (2018). Microstructure-tunable highly conductive graphene-metal composites achieved by inkjet printing and low temperature annealing. Journal of Micromechanics and Microengineering, 28(3), Article ID 035006.
Open this publication in new window or tab >>Microstructure-tunable highly conductive graphene-metal composites achieved by inkjet printing and low temperature annealing
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2018 (English)In: Journal of Micromechanics and Microengineering, ISSN 0960-1317, E-ISSN 1361-6439, Vol. 28, no 3, article id 035006Article in journal (Refereed) Published
Abstract [en]

We present a method for fabricating highly conductive graphene-silver composite films with a tunable microstructure achieved by means of an inkjet printing process and low temperature annealing. This is implemented by starting from an aqueous ink formulation using a reactive silver solution mixed with graphene nanoplatelets (GNPs), followed by inkjet printing deposition and annealing at 100 degrees C for silver formation. Due to the hydrophilic surfaces and the aid of a polymer stabilizer in an aqueous solution, the GNPs are uniformly covered with a silver layer. Simply by adjusting the content of GNPs in the inks, highly conductive GNP/Ag composites (> 106 S m(-1)), with their microstructure changed from a large-area porous network to a compact film, is formed. In addition, the printed composite films show superior quality on a variety of unconventional substrates compared to its counterpart without GNPs. The availability of composite films paves the way to the metallization in different printed devices, e.g. interconnects in printed circuits and electrodes in energy storage devices.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2018
Keyword
graphene, composite, inkjet printing
National Category
Materials Engineering
Identifiers
urn:nbn:se:uu:diva-345709 (URN)10.1088/1361-6439/aaa450 (DOI)000423867400001 ()
Funder
Swedish Foundation for Strategic Research , Dnr SE13-0061Swedish Research Council, 621-2014-5596
Available from: 2018-03-14 Created: 2018-03-14 Last updated: 2018-03-28Bibliographically approved
Gu, E., Wang, Q., Zhang, Y., Cong, C., Hu, L., Tian, P., . . . Qiu, Z.-J. (2017). A real-time Raman spectroscopy study of the dynamics of laser-thinning of MoS2 flakes to monolayers. AIP Advances, 7(12), Article ID 125329.
Open this publication in new window or tab >>A real-time Raman spectroscopy study of the dynamics of laser-thinning of MoS2 flakes to monolayers
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2017 (English)In: AIP Advances, ISSN 2158-3226, E-ISSN 2158-3226, Vol. 7, no 12, article id 125329Article in journal (Refereed) Published
Abstract [en]

Transition metal dichalcogenides (TMDCs) in monolayer form have attracted a great deal of attention for electronic and optical applications. Compared to mechanical exfoliation and chemical synthesis, laser thinning is a novel and unique “on-demand” approach to fabricate monolayers or pattern desired shapes with high controllability and reproducibility. Its successful demonstration motivates a further exploration of the dynamic behaviour of this local thinning process. Here, we present an in-situ study of void formation by laser irradiation with the assistance of temporal Raman evolution. In the analysis of time-dependent Raman intensity, an empirical formula relating void size to laser power and exposure time is established. Void in thinner MoS2 flakes grows faster than in thicker ones as a result of reduced sublimation temperature in the two-dimensional (2D) materials. Our study provides useful insights into the laser-thinning dynamics of 2D TMDCs and guidelines for an effective control over the void formation.

National Category
Nano Technology
Identifiers
urn:nbn:se:uu:diva-338543 (URN)10.1063/1.5008441 (DOI)000418950100019 ()
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2018-04-11Bibliographically approved
Zhang, D., Solomon, P., Zhang, S.-L. & Zhang, Z. (2017). An impedance model for the low-frequency noise originating from the dynamic hydrogen ion reactivity at the solid/liquid interface. Sensors and actuators. B, Chemical, 254, 363-369
Open this publication in new window or tab >>An impedance model for the low-frequency noise originating from the dynamic hydrogen ion reactivity at the solid/liquid interface
2017 (English)In: Sensors and actuators. B, Chemical, ISSN 0925-4005, E-ISSN 1873-3077, Vol. 254, p. 363-369Article in journal (Refereed) Published
Abstract [en]

Understanding the dynamics of hydrogen ion reactivity at the solid/liquid interface is of paramount importance for applications involving ion sensing in electrolytes. However, the correlation of this interfacial process to noise generation is poorly characterized. Here, the relationship is unveiled by characterizing the interfacial process with impedance spectroscopy assisted by a dedicated electrochemical impedance model. The model incorporates both thermodynamic and kinetic properties of the amphoteric hydrogen ion site-binding reactions with the surface OH groups. It further takes into consideration the distributed nature of the characteristic energy of the binding sites. The simulated impedance matches the experimental data better with an energy distribution of the kinetic parameters than with that of the thermodynamic ones. Since the potentiometric low-frequency noise (LFN) originating from the solid/liquid interface correlates excellently with the real part of its electrochemical impedance spectrum, this work establishes a method for evaluating sensing surface quality aimed at mitigating LFN.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-326714 (URN)10.1016/j.snb.2017.07.054 (DOI)000413308000045 ()
Funder
Swedish Research Council, VR 2014-5588Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology, GG 1459BCarl Tryggers foundation , CTS14-527Stiftelsen Olle Engkvist Byggmästare, 2016/39
Available from: 2017-07-26 Created: 2017-07-26 Last updated: 2018-04-11Bibliographically approved
Netzer, N. L., Must, I., Qiao, Y., Zhang, S.-L., Wang, Z. & Zhang, Z. (2017). Biomimetic supercontainers for size-selective electrochemical sensing of molecular ions. Scientific Reports, 7, Article ID 45786.
Open this publication in new window or tab >>Biomimetic supercontainers for size-selective electrochemical sensing of molecular ions
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 45786Article in journal (Refereed) Published
Abstract [en]

New ionophores are essential for advancing the art of selective ion sensing. Metal-organic supercontainers (MOSCs), a new family of biomimetic coordination capsules designed using sulfonylcalix[4] arenes as container precursors, are known for their tunable molecular recognition capabilities towards an array of guests. Herein, we demonstrate the use of MOSCs as a new class of size-selective ionophores dedicated to electrochemical sensing of molecular ions. Specifically, a MOSC molecule with its cavities matching the size of methylene blue (MB+), a versatile organic molecule used for bio-recognition, was incorporated into a polymeric mixed-matrix membrane and used as an ion-selective electrode. This MOSC-incorporated electrode showed a near-Nernstian potentiometric response to MB+ in the nano-to micro-molar range. The exceptional size-selectivity was also evident through contrast studies. To demonstrate the practical utility of our approach, a simulated wastewater experiment was conducted using water from the Fyris River (Sweden). It not only showed a near-Nernstian response to MB+ but also revealed a possible method for potentiometric titration of the redox indicator. Our study thus represents a new paradigm for the rational design of ionophores that can rapidly and precisely monitor molecular ions relevant to environmental, biomedical, and other related areas.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2017
National Category
Chemical Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-321839 (URN)10.1038/srep45786 (DOI)000398960200001 ()28393841 (PubMedID)
Funder
Swedish Foundation for Strategic Research , SSF ICA 12-0047Swedish Research Council, VR 2014-5588Göran Gustafsson Foundation for Research in Natural Sciences and Medicine, GG 1459BCarl Tryggers foundation , CTS14-527
Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2017-05-16Bibliographically approved
Zhang, D., Solomon, P., Zhang, S.-L. & Zhang, Z. (2017). Correlation of Low-Frequency Noise to the Dynamic Properties of the Sensing Surface in Electrolytes. ACS Sensors, 2(8), 1160-1166
Open this publication in new window or tab >>Correlation of Low-Frequency Noise to the Dynamic Properties of the Sensing Surface in Electrolytes
2017 (English)In: ACS Sensors, E-ISSN 2379-3694, Vol. 2, no 8, p. 1160-1166Article in journal (Refereed) Published
Abstract [en]

Low-frequency noise (LFN) is of significant implications in ion sensing. As a primary component of LFN for ion sensing in electrolytes, the solid/liquid interfacial noise remains poorly explored especially regarding its relation to the surface binding/debinding dynamic properties. Here, we employ impedance spectroscopy to systematically characterize this specific noise component for its correlation to the dynamic properties of surface protonation (i.e., hydrogen binding) and deprotonation (i.e., hydrogen debinding) processes. This correlation is facilitated by applying our recently developed interfacial impedance model to ultrathin TiO2 layers grown by means of atomic layer deposition (ALD) on a TiN metallic electrode. With an excellent fitting of the measured noise power density spectra by the model for the studied TiO2 layers, we are able to extract several characteristic dynamic parameters for the TiO2 sensing surface. The observed increase of noise with TiO2 ALD cycles can be well accounted for with an increased average binding site density. This study provides insights into how detailed surface properties may affect the noise performance of an ion sensor operating in electrolytes.

Keyword
impedance, ion-sensing, low frequency noise, site-binding model, solid/liquid interface
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-326716 (URN)10.1021/acssensors.7b00285 (DOI)000408702500011 ()28745041 (PubMedID)
Funder
Swedish Research Council, VR 2014-5588Göran Gustafsson Foundation for Research in Natural Sciences and Medicine, GG 1459BCarl Tryggers foundation , CTS14-527Stiftelsen Olle Engkvist Byggmästare, 2016/39Swedish Foundation for Strategic Research
Available from: 2017-07-26 Created: 2017-07-26 Last updated: 2017-12-11Bibliographically approved
Majee, S., Banerjee, D., Liu, X., Zhang, S.-L. & Zhang, Z.-B. (2017). Efficient and thermally stable iodine doping of printed graphene nano-platelets. Carbon, 117, 240-245
Open this publication in new window or tab >>Efficient and thermally stable iodine doping of printed graphene nano-platelets
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2017 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 117, p. 240-245Article in journal (Refereed) Published
Abstract [en]

We report on an efficient and highly thermally stable doping with iodine on ink-jet printed graphene films. The films consist of pristine few-layer graphene nano-platelates (p-GNPs) that are randomly stacked. With iodine doping simply by soaking in aqueous iodine solution, the printed p-GNPs films are enhanced in electrical conductivity by up to around 2 times. The doping effect exhibits excellent thermal stability up to 500 degrees C under high vacuum condition (10(-6) mBar) evidenced by electrical and spectroscopic means. Furthermore, the doping of iodine leads to a slight increment of work function by 0.07 eV. Using depth profile measurements, it is found that iodine species diffuse deeply into the films and likely intercalate between two adjacent p-GNPs which interpret the aforementioned efficient enhancement and thermal stability of the doping effect. The reported doping scheme offers a viable low-temperature optimization method for conductive electrodes with p-GNPs in the application of printed devices.

National Category
Materials Chemistry Other Physics Topics Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-322507 (URN)10.1016/j.carbon.2017.02.094 (DOI)000400212100027 ()
Funder
Swedish Foundation for Strategic Research , Dnr SE13-0061Swedish Research Council, 621-2014-5596
Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-05-30Bibliographically approved
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