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Zhang, S-L
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Publications (10 of 99) Show all publications
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, 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, 1160-1166 p.Article 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, 240-245 p.Article 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
Wen, C., Zeng, S., Arstila, K., Sajavaara, T., Zhu, Y., Zhang, Z. & Zhang, S.-L. (2017). Generalized Noise Study of Solid-State Nanopores at Low Frequencies. ACS Sensors, 2(2), 300-307.
Open this publication in new window or tab >>Generalized Noise Study of Solid-State Nanopores at Low Frequencies
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2017 (English)In: ACS Sensors, ISSN 2379-3694, Vol. 2, no 2, 300-307 p.Article in journal (Refereed) Published
Abstract [en]

Nanopore technology has been extensively investigated for analysis of biomolecules, and a success story in this field concerns DNA sequencing using a nanopore chip featuring an array of hundreds of biological nanopores (BioNs). Solid-state nanopores (SSNs) have been explored to attain longer lifetime and higher integration density than what BioNs can offer, but SSNs are generally considered to generate higher noise whose origin remains to be confirmed. Here, we systematically study lowfrequency (including thermal and flicker) noise characteristics of SSNs measuring 7 to 200 nm in diameter drilled through a 20-nmthick SiNx membrane by focused ion milling. Both bulk and surface ionic currents in the nanopore are found to contribute to the flicker noise, with their respective contributions determined by salt concentration and pH in electrolytes as well as bias conditions. Increasing salt concentration at constant pH and voltage bias leads to increase in the bulk ionic current and noise therefrom. Changing pH at constant salt concentration and current bias results in variation of surface charge density, and hence alteration of surface ionic current and noise. In addition, the noise from Ag/AgCl electrodes can become predominant when the pore size is large and/or the salt concentration is high. Analysis of our comprehensive experimental results leads to the establishment of a generalized nanopore noise model. The model not only gives an excellent account of the experimental observations, but can also be used for evaluation of various noise components in much smaller nanopores currently not experimentally available.

Keyword
flicker noise, nanopore, electrical double layer, model, power spectrum density, low frequency range, Hooge’s theory
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-315230 (URN)10.1021/acssensors.6b00826 (DOI)000395047000017 ()
Funder
Swedish Research Council, 621-2014-6300Stiftelsen Olle Engkvist Byggmästare, 2016/39Swedish Foundation for Strategic Research
Note

Chenyu Wen and Shuangshuang Zeng contributed equally to this work.

Available from: 2017-02-10 Created: 2017-02-10 Last updated: 2017-04-21Bibliographically approved
Majee, S., Liu, C., Wu, B., Zhang, S.-L. & Zhang, Z.-B. (2017). Ink-jet printed highly conductive pristine graphene patterns achieved with water-based ink and aqueous doping processing. Carbon, 114, 77-83.
Open this publication in new window or tab >>Ink-jet printed highly conductive pristine graphene patterns achieved with water-based ink and aqueous doping processing
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2017 (English)In: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 114, 77-83 p.Article in journal (Refereed) Published
Abstract [en]

We report an efficient inkjet printing of water-based pristine GNPs graphene ink and a facile aqueous halogen doping process that provides significant and thermally stable conductivity enhancement of printed patterns. Highly concentrated aqueous graphene ink populated by few-layer pristine graphene flakes is obtained by means of scalable shear exfoliation process with the aid of bromine intercalation. The as-printed GNP films which has been merely treated by drying at 100 degrees C exhibits DC conductivity (sigma(DC)) of similar to 1400 S/m likely due to bromine doping effect. This value is significantly increased to similar to 3 x 10(4) S/m when an additional treatment by means of dipping in aqueous iodine solution is applied prior to the drying. As contrast, sigma(DC) is increased to similar to 2.4 x 10(4) S/m when a mere annealing at elevated temperature in air is employed. When the aqueous iodine doping process and annealing at elevated temperature is combined, an unprecedented value of sigma(DC) similar to 10(5) S/m is achieved. The availability of water-based GNPs inks and low-temperature doping scheme for efficient and reliable conductivity enhancement has offered a pathway for the application of GNPs in different printed electronics devices.

National Category
Materials Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-317574 (URN)10.1016/j.carbon.2016.12.003 (DOI)000393249600010 ()
Funder
Swedish Foundation for Strategic Research , Dnr SE13-0061
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-11-29Bibliographically approved
Hinnemo, M., Zhao, J., Ahlberg, P., Hägglund, C., Djurberg, V., Scheicher, R. H., . . . Zhang, Z.-B. (2017). On Monolayer Formation of Pyrenebutyric Acid on Graphene. Langmuir, 33(15), 3588-3593.
Open this publication in new window or tab >>On Monolayer Formation of Pyrenebutyric Acid on Graphene
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2017 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 33, no 15, 3588-3593 p.Article in journal (Refereed) Published
Abstract [en]

As a two-dimensional material with high charge carrier mobility, graphene may offer ultrahigh sensitivity in biosensing. To realize this, the first step is to functionalize the graphene. This is commonly done by using 1-pyrenebutyric acid (PBA) as a linker for biornolecules. However, the adsorption of PBA on graphene remains poorly understood despite reports of successful biosensors functionalized via this route. Here, the PBA adsorption on graphene is characterized through a combination of Raman spectroscopy, ab initio calculations, and spectroscopic ellipsometry. The PBA molecules are found to form a self-assembled monolayer on graphene, the formation of which is self-limiting and Langmuirian. Intriguingly, in concentrated solutions, the PBA molecules are found to stand up and stack horizontally with their edges contacting the graphene surface. This morphology could facilitate a surface densely populated with carboxylic functional groups. Spectroscopic analyses show that the monolayer saturates at 5.3 PBA molecules per nm(2) and measures similar to 0.7 nm in thickness. The morphology study of this PBA monolayer sheds light on the pi-pi stacking of small-molecule systems on graphene and provides an excellent base for optimizing functionalization procedures.

National Category
Physical Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-322804 (URN)10.1021/acs.langmuir.6b04237 (DOI)000399860000003 ()28350965 (PubMedID)
Available from: 2017-06-08 Created: 2017-06-08 Last updated: 2017-06-09Bibliographically approved
Cardenas, J. F., Cadenbach, T., Zhang, Z.-B., Costa-Vera, C., Debut, A., Vaca, A. V., . . . Paz, J. L. (2017). Raman spectroscopy of carbon nano-particles synthesized by laser ablation of graphite in water. Revista mexicana de física, 63(1), 71-75.
Open this publication in new window or tab >>Raman spectroscopy of carbon nano-particles synthesized by laser ablation of graphite in water
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2017 (English)In: Revista mexicana de física, ISSN 0035-001X, Vol. 63, no 1, 71-75 p.Article in journal (Refereed) Published
Abstract [en]

Carbon nanoparticles (CNPs) have been synthesized by laser ablation of polycrystalline graphite in water using a pulsed Nd:YAG laser (1064 nm) with a width of 8 ns. Structural and mesoscopic characterization of the CNPs in the supernatant by Raman spectroscopy provide evidence for the presence of mainly two ranges of particle sizes: 1-5 nm and 10-50 nm corresponding to amorphous carbon and graphite NPs, respectively. These results are corroborated by complementary characterization using atomic force microscopy (AFM) and transmission electron microscopy (TEM). In addition, large (10-100 mu m) graphite particles removed from the surface are essentially unmodified (in structure and topology) by the laser as confirmed by Raman analysis.

Keyword
Raman spectroscopy, carbon nanoparticle, laser ablation, high resolution electron microscopy, atomic force microscopy
National Category
Physical Sciences Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-316132 (URN)000392362500011 ()
Available from: 2017-03-03 Created: 2017-03-03 Last updated: 2017-11-29Bibliographically approved
Jeong, S. H., Cruz, J., Chen, S., Gravier, L., Liu, J., Wu, Z., . . . Zhang, Z.-B. (2017). Stretchable thermoelectric generators metallized with liquid alloy. ACS Applied Materials and Interfaces, 9(18), 15791-15797.
Open this publication in new window or tab >>Stretchable thermoelectric generators metallized with liquid alloy
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2017 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 9, no 18, 15791-15797 p.Article in journal (Refereed) Published
Abstract [en]

Conventional thermoelectric generators (TEGs) are normally hard, rigid, and flat. However, most objects have curvy surfaces, which require soft and even stretchable TEGs for maximizing efficiency of thermal energy harvesting. Here, soft and stretchable TEGs using conventional rigid Bi2Te3 pellets metallized with a liquid alloy is reported. The fabrication is implemented by means of a tailored layer-by-layer fabrication process. The STEGs exhibit an output power density of 40.6 mu W/cm(2) at room temperature. The STEGs are operational after being mechanically stretched-and-released more than 1000 times, thanks to the compliant contact between the liquid alloy interconnects and the rigid pellets. The demonstrated interconnect scheme will provide a new route to the development of soft and stretchable energy-harvesting avenues for a variety of emerging electronic applications.

National Category
Energy Engineering Textile, Rubber and Polymeric Materials Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:uu:diva-281213 (URN)10.1021/acsami.7b04752 (DOI)000401307100064 ()28453282 (PubMedID)
Funder
Swedish Foundation for Strategic Research , EM11-0002, SE13-0061Swedish Research Council, 621-2014-5596
Available from: 2016-03-21 Created: 2016-03-21 Last updated: 2017-07-04Bibliographically approved
Li, H., Wen, C., Zhang, Y., Wu, D., Zhang, S.-L. & Qiu, Z.-J. (2016). Accelerating Gas Adsorption on 3D Percolating Carbon Nanotubes. Scientific Reports, 6, Article ID 21313.
Open this publication in new window or tab >>Accelerating Gas Adsorption on 3D Percolating Carbon Nanotubes
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2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 21313Article in journal (Refereed) Published
Abstract [en]

In the field of electronic gas sensing, low-dimensional semiconductors such as single-walled carbon nanotubes (SWCNTs) can offer high detection sensitivity owing to their unprecedentedly large surface-to-volume ratio. The sensitivity and responsivity can further improve by increasing their areal density. Here, an accelerated gas adsorption is demonstrated by exploiting volumetric effects via dispersion of SWCNTs into a percolating three-dimensional (3D) network in a semiconducting polymer. The resultant semiconducting composite film is evaluated as a sensing membrane in field effect transistor (FET) sensors. In order to attain reproducible characteristics of the FET sensors, a pulsed-gate-bias measurement technique is adopted to eliminate current hysteresis and drift of sensing baseline. The rate of gas adsorption follows the Langmuir-type isotherm as a function of gas concentration and scales with film thickness. This rate is up to 5 times higher in the composite than only with an SWCNT network in the transistor channel, which in turn results in a 7-fold shorter time constant of adsorption with the composite. The description of gas adsorption developed in the present work is generic for all semiconductors and the demonstrated composite with 3D percolating SWCNTs dispersed in functional polymer represents a promising new type of material for advanced gas sensors.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-281797 (URN)10.1038/srep21313 (DOI)000370371400001 ()26888337 (PubMedID)
Funder
Swedish Research Council, 2014-5591
Available from: 2016-03-30 Created: 2016-03-30 Last updated: 2017-11-30Bibliographically approved
Chen, X., Zhang, T., Constantoudis, V., Zhang, S.-L. & Zhang, Z. (2016). Aged hydrogen silsesquioxane for sub-10 nm line patterns. Microelectronic Engineering, 163, 105-109.
Open this publication in new window or tab >>Aged hydrogen silsesquioxane for sub-10 nm line patterns
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2016 (English)In: Microelectronic Engineering, ISSN 0167-9317, E-ISSN 1873-5568, Vol. 163, 105-109 p.Article in journal (Refereed) Published
Abstract [en]

Hydrogen silsesquioxane (HSQ) has been used as a negative tone resist in electron beam lithography to define sub-10 nm patterns. The spontaneous polymerization in HSQ usually called aging in this context, sets a restricted period of time for a vendor-warranted use in patterning such small features with satisfactory line-edge roughness (LER). Here, we study the effect of HSQ aging on sensitivity and LER by focusing on exposing line patterns of 10 nm width in various structures. The results show that the 10 nm lines are easily achievable and the LER of the patterned lines remains unaltered even with HSQ that is stored 10 months beyond the vendor-specified expiration date. However, an increasingly pronounced decrease with time of the threshold electron dose (D-th), below which the line width would become less than 10 nm, is observed. After the HSQ expiration for 10 months, the 10 nm lines can be manufactured by reducing D-th to a level that is technically manageable with safe margins. In addition, the inclusion of a prebaldng step at 220 degrees C to accelerate the aging process results in a further reduced D-th for the 10 nm lines and thereby leads to a shortened writing time. The time variation of D-th with respect to the vendor-specified production date of HSQ is found to follow an exponential function of time and can be associated to the classical nucleation-growth polymerization process in HSQ.

Keyword
Electron beam lithography (EBL); Hydrogen silsesquioxane (HSQ); 10 nm wide resist lines; Aging effect; Line edge roughness (LER); Prebaking
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-300188 (URN)10.1016/j.mee.2016.06.011 (DOI)000381837300015 ()
Funder
Swedish Foundation for Strategic Research , ICA 12-0047 SE13-0033Swedish Research Council, 2014-5588 2014-5591Göran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology, GG 1459BCarl Tryggers foundation , CTS14-527
Available from: 2016-08-04 Created: 2016-08-04 Last updated: 2017-11-28Bibliographically approved
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