Article
Chemistry, Multidisciplinary
Xiangyang Li, Shuangchen Ruan, Haiou Zhu
Summary: High responsivity and fast photoresponse time in a graphene-based photodetector have been achieved by growing SnS nanoflakes directly on graphene, avoiding contamination and ensuring high quality and low trap density. The photodetector exhibits extended broad-spectrum photoresponse and a large photoresponsivity of 41.3 AW(-1) with a fast response time of around 19 ms at 1550 nm. Strategies for broadband response and sensitive photodetectors with SnS nanoflakes/graphene are discussed.
Article
Engineering, Electrical & Electronic
Yuxuan Yang, Zhaoping Zhong, Jiefei Li, Haoran Du, Wei Wang, Jiawei Huang
Summary: In this study, NiCo-LDH/rGNS material with excellent electrochemical performance was successfully prepared at room temperature through a series of experimental methods. The specific capacitance reached 2179 F/g, with only a 19% reduction at 10 A/g, and maintained 88% of the initial specific capacitance after 3000 cycles, providing a potential application material for future commercial applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Chemical
Zhen Lin, Chuan Hu, Qinglin Liu, Qiugen Zhang
Summary: This work demonstrates a versatile strategy to create nanosheet-templated water channels in laminar graphene oxide membranes with controllable interlayer spacing. The resulting membranes have higher water permeance and good molecule separation properties compared to unintercalated membranes. This intercalation and sacrificing nanosheets strategy has higher potential in controlling d-spacing of laminar membranes than traditional intercalation.
Article
Materials Science, Multidisciplinary
Meysam Raoufi, Steffen Ruehl, Sreelakshmi Chandrabose, Atul Shukla, Bowen Sun, Emil-List Kratochvil, Sylke Blumstengel, Dieter Neher
Summary: Monolayer transition metal dichalcogenides (TMDCs) are highly promising materials for photodetection due to their high carrier mobility and direct-bandgap transition semiconductor properties. However, TMDCs-based photodetectors have a slow response time due to persistent hole capture. This study investigates the photoresponse dynamics of a hybrid photodetector incorporating an ultrathin layer of phthalocyanine (H2Pc) molecules on ML MoS2 using intensity-modulated photocurrent spectroscopy (IMPS). The addition of the H2Pc layer significantly improves the response speed and responsivity of the photodetector by enhancing hole detrapping and increasing photon absorption.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Kaiwen Gong, Lianbi Li, Wenzhi Yu, Haoran Mu, Jian Yuan, Ran Hao, Baiquan Liu, Zengxia Mei, Luyao Mei, Haozhe Li, Shenghuang Lin
Summary: This paper reports a synthesis method using exfoliation and CVD to fabricate GaSe/PtSe2 heterojunction photodetectors. The devices exhibit the highest responsivity of about 1.7 A/W and detectivity of 3.51 x 1012 Jones at a -10 V bias under the avalanche mode. Additionally, the photodetector shows a clear photovoltaic effect and can operate in a self-powered mode.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Huijie Hu, Weili Zhen, Zhilai Yue, Rui Niu, Feng Xu, Wanli Zhu, Keke Jiao, Mingsheng Long, Chuanying Xi, Wenka Zhu, Changjin Zhang
Summary: A mixed-dimensional BiSeI/GaSe van der Waals heterostructure with visible light detection ability and fast response time has been designed, providing a prospective approach to low-dimensional optoelectronic devices with rapid switching capabilities.
NANOSCALE ADVANCES
(2023)
Article
Nanoscience & Nanotechnology
Chan Wook Jang, Dong Hee Shin, Suk-Ho Choi
Summary: The study investigates the improvement of the performance of GR/PSi photodetectors (PDs) by inserting a WS2 interfacial layer between the GR/PSi interface. The insertion of the WS2 interfacial layer enhances the responsivity, detectivity, and external quantum efficiency of the PDs, and reduces the response time. However, a loss in responsivity value is observed after long-term testing.
ACS APPLIED NANO MATERIALS
(2022)
Article
Electrochemistry
Chunyang Xu, Xuandong Kou, Dongdong Liu, Hai-Tao Fang
Summary: The study presents a simple method to construct a compact vertically aligned TiO2-graphene nanosheet electrode with a large thickness of 130 μm, which facilitates ion diffusion kinetics and electron transport. The electrode shows high volumetric and areal capacities for lithium-ion batteries, demonstrating the potential of vertically aligned architecture in 2D nanomaterial electrodes.
ELECTROCHIMICA ACTA
(2021)
Article
Chemistry, Physical
Worawut Muangrat, Michiko Obata, Myo Than Htay, Masatsugu Fujishige, Paweena Dulyaseree, Winadda Wongwiriyapan, Yoshio Hashimoto
Summary: The hybrid nitrogen-doped graphene nanosheet-grafted double-walled carbon nanotube (NG-DWCNT) material was successfully synthesized by chemical vapor deposition (CVD) and thermal CVD techniques, exhibiting a sharp-edged petal-like structure and a higher specific capacitance value. This material has potential applications in electrochemical conversion and energy storage devices.
Article
Chemistry, Physical
Huanyu Liang, Yongcheng Zhang, Shujin Hao, Luhan Cao, Yanhong Li, Qiang Li, Dong Chen, Xia Wang, Xiangxin Guo, Hongsen Li
Summary: This study demonstrates the use of porous CoV2O6 nanosphere@graphene oxide composites as an anode material for potassium-ion capacitors (PICs) for the first time, showing high performance in terms of discharge capacity and rate capability. The electrochemical reaction mechanism of CoV2O6 and its high electron/K-ion conductivity are comprehensively revealed through various experiments. The PICs based on this anode and activated carbon cathode exhibit high energy/power density and an ultralong lifespan.
ENERGY STORAGE MATERIALS
(2021)
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
Physics, Applied
Sahin Sorifi, Shuchi Kaushik, Hardhyan Sheoran, Rajendra Singh
Summary: In this study, a 2D/3D vertical van der Waals p-n heterojunction based on p-type gallium selenide (GaSe) and n-type gallium oxide (Ga2O3) is fabricated and characterized. The conduction band offset at the GaSe/Ga2O3 hetero-interface is estimated using Kelvin Probe Force Microscopic (KPFM) measurements, and the band diagrams are designed accordingly. The diode-like behavior observed in the current-voltage measurements is attributed to the type-II band alignment at the p-n junction interface. The heterostructure exhibits high current rectification ratio and promising photoresponse properties, making it a potential candidate for efficient optoelectronic devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Hao Zhang, Jing Yao, Shifeng Zhang, Haiqun Chen
Summary: Carboxylated graphene oxide with a high percentage of carboxyl groups showed excellent high-temperature resistance and can serve as an efficient plugging agent in water-based muds.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Qiong Bi, Qingxiang Ma, Kai Tao, Lei Han
Summary: In this study, ultrathin Ni-MOF nanosheets were grafted onto Co3O4 nanosheets to create hierarchical core-shell Co3O4@Ni-MOF 2D nanosheet arrays, exhibiting high specific capacity, energy density, and good long-term durability. The unique structure and synergic effects of the core and shell greatly enhance the performance of the Co3O4@Ni-MOF/NF electrode, showing great promise for real energy storage devices.
DALTON TRANSACTIONS
(2021)
Article
Engineering, Electrical & Electronic
Rini Jain, Rhishikesh Bagul, Pravin Wadekar, Surajit Some
Summary: The green synthetic method for reducing graphene oxide to reduced graphene oxide using natural monoterpenoid thymol has shown to be a simple, sustainable, economically feasible, and environmentally friendly approach. The resulting T-RGO exhibits high specific capacitance and energy density, indicating its potential for energy-storage graphene materials synthesis.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Nannan Shan, Chaoran Huang, Robert T. Lee, Narges Manavi, Lianbin Xu, Viktor Chikan, Peter Heinz Pfromm, Bin Liu
Article
Chemistry, Physical
K. Mogyorosi, K. Sarosi, I Seres, P. Jojart, M. Fule, V Chikan
JOURNAL OF PHYSICAL CHEMISTRY A
(2020)
Article
Optics
Roland Flender, Adam Borzsonyi, Viktor Chikan
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Pratikshya Sharma, Noah Holliger, Peter Heinz Pfromm, Bin Liu, Viktor Chikan
Article
Chemistry, Inorganic & Nuclear
Basanta Acharya, Viktor Chikan
Correction
Optics
Roland Flender, Adam Borzsonyi, Viktor Chikan
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Physical
Bin Liu, Narges Manavi, Hao Deng, Chaoran Huang, Nannan Shan, Viktor Chikan, Peter Pfromm
Summary: Using dual-site models for NH3 synthesis with Mn4N-supported Ni-3 and Fe-3 clusters showed that Fe-3@Mn4N and Ni-3@Mn4N had the highest turnover frequencies. The beneficial effects of interfacial N-v sites were most pronounced when N binding energy and N-2 activation transition-state energy were either too strong or too weak while being high, otherwise excessive N-v sites may hinder catalyst performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Roland Flender, Adam Borzsonyi, Viktor Chikan
Summary: This study compares the efficiency of terahertz pulse generation using single-color and two-color schemes of mid-infrared pulses. The results show that as the duration of the driving pulses decreases, the second harmonic generation crystal can be omitted. The most efficient terahertz pulse generation occurs with different pulse parameters in different optical cycle ranges.
Article
Chemistry, Multidisciplinary
Pavel A. Markeev, Emad Najafidehaghani, Gergely F. Samu, Krisztina Sarosi, Sirri Batuhan Kalkan, Ziyang Gan, Antony George, Veronika Reisner, Karoly Mogyorosi, Viktor Chikan, Bert Nickel, Andrey Turchanin, Michel P. de Jong
Summary: We measured exciton dynamics in van der Waals heterojunctions of TMDCs and OSs. The results showed slower hole transfer rates in A-exciton decay in MoS2-pentacene heterojunctions compared to previously reported results. However, faster hole transfer rates were observed in B-exciton decay in WSe2-pentacene heterojunctions. Our work provides important insights into excitonic dynamics in TMDC-OS heterojunctions.
Article
Materials Science, Multidisciplinary
Pratikshya Sharma, Peter Heinz Pfromm, Bin Liu, Viktor Chikan
Summary: The study demonstrates the direct one-pot synthesis of gamma-Fe2O3 nanoparticles through an inductive heating method, using acetylferrocene as a solid precursor for the first time. Oleylamine and trioctylamine act as solvent, binding ligand, and reducing agent in the synthesis process to produce gamma-Fe2O3 NPs with a relatively narrow size distribution.
MATERIALS ADVANCES
(2021)
Article
Nanoscience & Nanotechnology
Wasundara Hulangamuwa, Basanta Acharya, Viktor Chikan, Ryan J. Rafferty
ACS APPLIED NANO MATERIALS
(2020)
Proceedings Paper
Optics
R. Flender, B. Kiss, A. Borzsonyi, V Chikan
NONLINEAR OPTICS AND APPLICATIONS XI
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Noah Holliger, Pratikshya Sharma, Viktor Chikan
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Viktor Chikan
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Meeting Abstract
Chemistry, Multidisciplinary
Laszlo Bodnar, Viktor Chikan
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)