Article
Nanoscience & Nanotechnology
Luca Anzi, Artur Tuktamyshev, Alexey Fedorov, Amaia Zurutuza, Stefano Sanguinetti, Roman Sordan
Summary: This study demonstrates a GaAs FET with a monolayer graphene gate, where the threshold voltage can be externally controlled by an additional control gate. The graphene gate forms a Schottky junction with the transistor channel, allowing for modulation of channel conductivity and threshold voltage control.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Multidisciplinary Sciences
Rami Yazbeck, Yixin Xu, Tyrone Porter, Chuanhua Duan
Summary: This study presents a bioinspired rapid and reversible nanopore gating strategy utilizing controlled nanoparticle blockage. The gating strategy can respond within milliseconds to external voltage or pressure stimuli, and achieve controlled chemical releasing. With exceptional spatial and temporal control, this strategy is expected to have applications in drug delivery, biotic-abiotic interfacing, and neuromorphic computing.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Yantao Zhang, Yubin Yuan, Guiming Cao, Chuanyu Han, Xin Li, Xiaoli Wang, Guohe Zhang, Li Geng, Weihua Liu
Summary: A unique photoresponse of graphene field-effect transistor to laser pulse after a switch of back-gate voltage, referred as fresh-bias photoresponse (FBPR), is reported. FBPR suggests a prompt charge transfer process triggered by laser illumination, and the transferred charge remains as long as the back-gate voltage remains unchanged. This mechanism may offer a new approach for developing phototransistors, photodetectors or photoelectronic memory devices in the future.
Article
Chemistry, Multidisciplinary
Yu-Lin Hu, Yu Hua, Zhong-Qin Pan, Jia-Han Qian, Xiao-Yang Yu, Ning Bao, Xiao-Lei Huo, Zeng-Qiang Wu, Xing-Hua Xia
Summary: A PNP nanofluidic bipolar junction transistor has been developed in this study, showing different responses of currents and high current gain under optimal conditions. It is promising for the fabrication of nanofluidic devices with logical-control functions.
Article
Nanoscience & Nanotechnology
Michael Geiger, Robin Lingstaedt, Tobias Wollandt, Julia Deuschle, Ute Zschieschang, Florian Letzkus, Joachim N. Burghartz, Peter A. van Aken, R. Thomas Weitz, Hagen Klauk
Summary: The study investigates the use of plasma-assisted oxidation of vacuum-deposited titanium gate electrodes to produce titanium oxide, which is used as the first component of a hybrid TiOx/SAM gate dielectric in flexible organic TFTs. These transistors demonstrate a gate-dielectric capacitance of approximately 1 mu F cm(-2), a subthreshold swing of 59 mV decade(-1) (close to the physical limit at room temperature within measurement error), and an on/off current ratio of 10(7) for a gate-source-voltage range of 1V even at channel lengths as small as 0.7 mu m.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Ping Zhou, Jueting Zheng, Tianyang Han, Lijue Chen, Wenqiang Cao, Yixuan Zhu, Dahai Zhou, Ruihao Li, Yingyu Tian, Zitong Liu, Junyang Liu, Wenjing Hong
Summary: An electrostatic gating method was used to tune the conductance of single-molecule junctions, showing a variation in conductance with different gating voltages. The study demonstrated that the energy alignment of the molecular junction could be changed by altering the applied gating voltage, impacting the charge transport properties. This work provides a simple method for exploring the charge transport properties at the single-molecule scale.
Review
Chemistry, Multidisciplinary
Yanfang Wu, J. Justin Gooding
Summary: This review provides an overview of the concepts, fabrication, and applications of nanopore sensors, with a focus on their potential and recent developments in quantitative analysis.
CHEMICAL SOCIETY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Chih-Yi Cheng, Wei-Liang Pai, Yi-Hsun Chen, Naomi Tabudlong Paylaga, Pin-Yun Wu, Chun-Wei Chen, Chi-Te Liang, Fang-Cheng Chou, Raman Sankar, Michael S. Fuhrer, Shao-Yu Chen, Wei-Hua Wang
Summary: This study investigates the intersystem Coulomb interactions in IL-functionalized InSe field-effect transistors through displacement current measurements. The research uncovers a strong self-gating effect and reveals the IL-phase-dependent transport characteristics. Raman spectroscopy confirms the dominance of self-gating caused by the correlation between the intra- and intersystem Coulomb interactions. This study is significant for understanding the capacitive coupling at the InSe/IL interface.
Article
Chemistry, Multidisciplinary
Shujie Yu, Lei Chen, Yinping Pan, Yue Wang, Denghui Zhang, Guangting Wu, Xinxin Fan, Xiaoyu Liu, Ling Wu, Lu Zhang, Wei Peng, Jie Ren, Zhen Wang
Summary: Recent studies have shown that the critical currents of metallic superconducting nanowires and Dayem bridges can be locally tuned using a gate voltage. In this study, a gate-tunable Josephson junction structure was reported, constructed from a three-dimensional niobium nanobridge junction with a voltage gate on top. The critical current of this structure can be tuned to zero by increasing the gate voltage, and the flux modulation generated by Josephson interference can also be tuned in a similar manner. Therefore, this gate-tunable Josephson junction structure shows promise for high integration level superconducting circuit fabrication.
Article
Chemistry, Multidisciplinary
David P. Hoogerheide, Tatiana K. Rostovtseva, Daniel Jacobs, Philip A. Gurnev, Sergey M. Bezrukov
Summary: The naturally occurring nanopore VDAC can be used to trap and analyze proteins at the single-molecule level, revealing variations in unbinding times of alpha Syn on lipid surfaces. Unbinding times depend strongly on lipid composition, with lipid membranes where alpha Syn binds weakly showing slow electromechanical unbinding subpopulations. The conformation of alpha Syn on the membrane surface plays a crucial role in its unbinding process.
Article
Computer Science, Information Systems
Tamiris Grossl Bade, Hassan Hamad, Adrien Lambert, Herve Morel, Dominique Planson
Summary: The instability of threshold voltage in p-GaN gate high electron mobility transistors (HEMTs) has been identified in recent years. This can cause reliability issues in switching applications and may be accompanied by other degradation mechanisms. In this study, a Vth measurement protocol originally established for SiC MOSFETs is applied to GaN HEMTs using the triple sense protocol, which involves preconditioning the transistor gate with voltage bias. Experimental results have confirmed that the proposed protocol enhances the stability of Vth measurement, even after experiencing degrading voltage bias stress on both drain and gate.
Article
Chemistry, Multidisciplinary
Hanyu Wang, Yan Li, Peng Gao, Jina Wang, Xuefeng Meng, Yin Hu, Juehan Yang, Zihao Huang, Wei Gao, Zhaoqiang Zheng, Zhongming Wei, Jingbo Li, Nengjie Huo
Summary: This study develops a photovoltaic detector with polarization- and gate-tunable optoelectronic reverse phenomenon, which can acquire higher resolution and more surface information of imaging targets by identifying the polarization of light. The device exhibits a wide range of current rectification ratio and clear object imaging, with a polarization ratio value of approximately 30, making significant progress in polarimetric imaging and multifunction integration applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Farzad Mehrdad, Zahra Ahangari
Summary: This paper comprehensively evaluates the unique features, feasibility, and limitations of dual material gate fin field effect transistor for tuning the threshold voltage in the nanoscale regime. The performance of the device can be significantly improved by employing a gate configuration with adjustable workfunction values, allowing operation at a selected threshold voltage. The simulation results show the superiority of the dual material structure in adjusting the threshold voltage and improving the electrical performance of the device.
Article
Physics, Multidisciplinary
Huijie Wu, Xiaojie Liu, Lifeng Feng, Haitao Yin
Summary: In this study, we investigated the modulation of spin transport in a single chromium porphyrin molecule using gate voltage and the photogalvanic effect. We found that gate voltage can effectively regulate the spin filtering effect under a certain bias voltage. Additionally, when the molecule is connected to two asymmetrically connected gold nanowire electrodes, fully polarized and even pure spin currents can be generated under the irradiation of linearly polarized light. Our findings provide potential pathways for designing single-molecule spintronics and optoelectronic devices.
Article
Nanoscience & Nanotechnology
Xuming Wu, Guoying Gao, Lei Hu, Dan Qin
Summary: The experimentally synthesized Nb2SiTe4 has been identified as a stable layered narrow-gap semiconductor, with its few-layers based field-effect transistors (FETs) showing potential for ambipolar devices and mid-infrared detection. Research has demonstrated that monolayers of Nb2XTe4 exhibit large p-type Seebeck coefficients, with the gate voltage effect enhancing the thermoelectric performance of Nb2SiTe4-based FETs. The study suggests that Nb2XTe4 monolayers are promising candidates for 2D thermoelectric materials and devices.
Article
Multidisciplinary Sciences
Peter A. Summers, Benjamin W. Lewis, Jorge Gonzalez-Garcia, Rosa M. Porreca, Aaron H. M. Lim, Paolo Cadinu, Nerea Martin-Pintado, David J. Mann, Joshua B. Edel, Jean Baptiste Vannier, Marina K. Kuimova, Ramon Vilar
Summary: The study demonstrates a method for identifying G-quadruplexes (G4s) within nuclei of live and fixed cells using a fluorescent probe combined with fluorescence lifetime imaging microscopy. This method allows for the study of interactions between G4s and non-fluorescent small molecules, as well as the exploration of G4 stability mechanisms in live cells.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Longhua Tang, Binoy Paulose Nadappuram, Paolo Cadinu, Zhiyu Zhao, Liang Xue, Long Yi, Ren Ren, Jiangwei Wang, Aleksandar P. Ivanov, Joshua B. Edel
Summary: The practical implementation of quantum tunnelling for high-resolution study of nanoscale objects is hindered by the lack of simple, stable probes.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Dana Al Sulaiman, Alfie Gatehouse, Aleksandar P. Ivanov, Joshua B. Edel, Sylvain Ladame
Summary: Fast sampling and length-dependent detection of short double-stranded DNA fragments in bodily fluids using hydrogel-filled nanopores technology, with a significant increase in signal-to-noise ratio and resolution compared to traditional methods. The technology allows for tunability in both sampling and detection, with increased sampling time leading to higher local DNA concentration at the tip before detection, enabling good resolution of fragments up to 250 bp long.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Ren Ren, Maozhong Sun, Pratibha Goel, Shenglin Cai, Nicholas A. Kotov, Hua Kuang, Chuanlai Xu, Aleksandar P. Ivanov, Joshua B. Edel
Summary: Highly sensitive and selective molecular probes made from nanoparticles have been designed for single-molecule nanopore sensing, successfully resolving and detecting both single and paired nanoparticles for applications such as antigen/antibody detection and microRNA sequence analysis. This technology is expected to significantly contribute to the development of highly sensitive and selective strategies for disease diagnosis and screening without the need for sample processing or amplification, while requiring minimal sample volume.
ADVANCED MATERIALS
(2021)
Review
Chemistry, Multidisciplinary
Si-Xuan Guo, Cameron L. Bentley, Minkyung Kang, Alan M. Bond, Patrick R. Unwin, Jie Zhang
Summary: This article introduces two advanced spatiotemporal voltammetric techniques for electrocatalytic studies, which provide important insights into the electrochemical reduction of CO2. Fourier transformed large-amplitude alternating current voltammetry allows the resolution of rapid electron-transfer processes, while scanning electrochemical cell microscopy provides high-resolution activity maps and potentiodynamic movies of catalyst surfaces.
ACCOUNTS OF CHEMICAL RESEARCH
(2022)
Article
Multidisciplinary Sciences
Dan-Qing Liu, Minkyung Kang, David Perry, Chang-Hui Chen, Geoff West, Xue Xia, Shayantan Chaudhuri, Zachary P. L. Laker, Neil R. Wilson, Gabriel N. Meloni, Marko M. Melander, Reinhard J. Maurer, Patrick R. Unwin
Summary: The study combines experimental and theoretical methods to investigate the outer-sphere electron transfer mechanism at graphene grown on a copper electrode, revealing slower kinetics for multi-layer graphene compared to monolayer graphene.
NATURE COMMUNICATIONS
(2021)
Article
Electrochemistry
Daniel Martin-Yerga, Minkyung Kang, Patrick R. Unwin
Summary: This study uses scanning electrochemical cell microscopy (SECCM) to investigate the formation of solid-electrolyte interphase (SEI) on graphite surfaces in Li-ion batteries. The presence of step edges on the surface promotes the formation of a more passivating SEI. The study also shows that an unstable SEI can be detected under fast formation conditions, while a slow formation rate leads to the growth of an increasingly passivating SEI.
Article
Chemistry, Multidisciplinary
Cameron L. Bentley, Minkyung Kang, Saheed Bukola, Stephen E. Creager, Patrick R. Unwin
Summary: In this study, local ion-flux imaging was performed on chemical vapor deposition (CVD) graphene vertical bar Nafion membranes using an electrochemical ion (proton) pump cell mode of scanning electrochemical cell microscopy (SECCM). The results show that most of the CVD graphene vertical bar Nafion membrane is impermeable to proton transport, with transmission occurring at localized sites across a small area of the membrane. This suggests that rare atomic defects are responsible for proton conductance.
Article
Chemistry, Analytical
Oluwasegun J. Wahab, Minkyung Kang, Gabriel N. Meloni, Enrico Daviddi, Patrick R. Unwin
Summary: This study investigates nanoscale electrochemistry at indium tin oxide (ITO) electrodes using high-resolution scanning electrochemical cell microscopy (SECCM). The research reveals the spatially heterogeneous charge transfer activity of ITO surfaces and measures a significantly higher charge transfer rate at the nanoscale compared to the macroscale.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Oluwasegun J. Wahab, Minkyung Kang, Enrico Daviddi, Marc Walker, Patrick R. Unwin
Summary: Understanding how crystallographic orientation affects the electrocatalytic performance of metal catalysts is crucial for improving catalyst efficiency. This study combines scanning electrochemical cell microscopy (SECCM) with electron backscatter diffraction (EBSD) to investigate the correlation between surface crystallographic orientations on polycrystalline copper (Cu) and activity under CO2 electroreduction conditions. The results show that the order of activity is (111) < (100) < (110) among the Cu primary orientations. Furthermore, the study reveals that the ease of electrochemical stripping of the naturally formed passive layer on Cu is grain-dependent, with low-index facets being easier to strip. This research provides a method to rank the most active surfaces for further study.
Article
Chemistry, Multidisciplinary
Cameron L. Bentley, Lachlan F. Gaudin, Minkyung Kang
Summary: Local voltammetric analysis with a scanning electrochemical droplet cell technique, in combination with a new data processing protocol, is used to directly identify previously unseen regions of elevated electrocatalytic activity on the basal plane of molybdenum disulfide. Understanding the nature of these microscopic catalytic active sites is crucial for the rational design of renewable fuel production materials.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Xiangdong Xu, Daniel Martin-Yerga, Nicholas E. Grant, Geoff West, Sophie L. Pain, Minkyung Kang, Marc Walker, John D. Murphy, Patrick R. Unwin
Summary: Understanding the formation of SEI and (de)lithiation phenomena at silicon electrodes is crucial for improving the performance and longevity of Si-based lithium-ion batteries. However, these processes are still elusive, particularly the role of Si surface termination.
Article
Chemistry, Multidisciplinary
Minkyung Kang, Cameron L. Bentley, J. Tyler Mefford, William C. Chueh, Patrick R. Unwin
Summary: This study investigates the variations in electrochemical properties of nanostructured electrocatalysts at different length scales, particularly focusing on the oxygen evolution reaction (OER) activity of beta-Co(OH)(2) platelet particles. The results reveal the significance of heterogeneous activity at the single-particle level, as well as the importance of factors such as particle structure, particle-support interaction, and presence of defects, in governing the electrochemical activities of these materials. The study suggests a roadmap for the rational design and optimization of nanostructured electrocatalysts for alkaline water electrolysis.
Article
Chemistry, Physical
Oluwasegun J. Wahab, Minkyung Kang, Enrico Daviddi, Marc Walker, Patrick R. Unwin
Summary: This study investigates the influence of crystallographic orientation on the electrocatalytic performance of polycrystalline copper (Cu) in CO2 electroreduction. The results demonstrate a correlation between step and kink density of secondary surface facets and electroreduction activity. Additionally, the ease of oxide removal on low-index facets is found to follow the order of (100) > (111) > (110).
Article
Chemistry, Analytical
Baoping Chen, David Perry, James Teahan, Ian J. McPherson, James Edmondson, Minkyung Kang, Dimitrios Valavanis, Bruno G. Frenguelli, Patrick R. Unwin
Summary: An artificial synapse has been developed to mimic ultramicroelectrode (UME) amperometric detection of single cell exocytosis by rapidly pulsing neurotransmitters like dopamine locally and on demand at defined locations on a carbon fiber (CF) UME in each experiment. Analysis of the resulting data reveals spatiotemporal heterogeneous electrode activity at the nanoscale and submillisecond time scale for dopamine electrooxidation, which is related to heterogeneities in the surface chemistry of the CF UME as shown through complementary surface charge mapping and finite element method (FEM) simulations.
ACS MEASUREMENT SCIENCE AU
(2021)
