Article
Chemistry, Multidisciplinary
Jun Liu, Taoyi Kong, Huan-Ming Xiong
Summary: Fluorescent silk with promising applications in various fields has been developed using carbon dots made from mulberry leaves. Silkworms fed with these carbon dots exhibit bright red fluorescence and grow healthily, ultimately producing cocoons and turning into moths that lay fluorescent eggs. The carbon dots have excellent biocompatibility and fluorescence stability.
ADVANCED MATERIALS
(2022)
Editorial Material
Multidisciplinary Sciences
Soo Ho Choi, Seok Joon Yun, Yo Seob Won, Chang Seok Oh, Soo Min Kim, Ki Kang Kim, Young Hee Lee
Summary: This article discusses the importance of industrial-scale manufacturing of graphene and other 2D materials, as well as the limitations and opportunities for improvement of three state-of-the-art mass production techniques.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Haitao Wang, Wenshuang Sun, Yingying Liu, Hanyu Ma, Tielong Li, Kunyi Andrew Lin, Kuibo Yin, Shuangjiang Luo
Summary: The graphene nanoribbons/carbon nanotubes composite, synthesized by chemical vapor deposition, demonstrated enhanced electrochemical properties and high desalination capacity when used as electrode for membrane capacitive desalination.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Qingfeng Zhang, Xueli Cheng, Chengxin Wang, Apparao M. Rao, Bingan Lu
Summary: A novel sulfur-assisted method was introduced to convert tetraphenyltin into high purity crystalline graphene, resulting in the preparation of three-dimensional few-layer graphene microspheres ideal for energy storage applications. These microspheres exhibited excellent performance and stability, promising scalable production of graphene-based energy storage devices.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Crystallography
Naixu Liu, Qingguo Tang, Bin Huang, Yaping Wang
Summary: This review summarizes recent advanced graphene synthesis methods and their impact on the structure, cost, and preparation efficiency of graphene, as well as the feasibility of preparing graphene using polymers for peeling and filling graphite. It was found that mass production of high-quality graphene can be achieved by utilizing the viscoelasticity of polymers and their affinity to the graphite surface.
Review
Materials Science, Multidisciplinary
Baojun Sun, Jinbo Pang, Qilin Cheng, Shu Zhang, Yufen Li, Congcong Zhang, Dehui Sun, Bergoi Ibarlucea, Yang Li, Duo Chen, Huaimin Fan, Qingfang Han, Mengxin Chao, Hong Liu, Jingang Wang, Gianaurelio Cuniberti, Lin Han, Weijia Zhou
Summary: The discovery of graphene has opened up new platforms for physics, electronic engineering, and materials sciences. Among various synthesis approaches, chemical vapor deposition shows promise for wafer-scale growth. This article provides a comprehensive overview of wafer-scale graphene synthesis and its potential applications in electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Fabian Amaya-Garcia, Michael Caldera, Anna Koren, Stefan Kubicek, Jorg Menche, Miriam M. Unterlass
Summary: The hydrothermal synthesis of 2,3-diarylquinoxalines from 1,2-diketones and o-phenylendiamines is simple, fast, and high-yielding, without the need for organic solvents, strong acids, or toxic catalysts. The method is environmentally friendly and less toxic compared to existing methods, with potential for improved reaction yields. The synthesized compounds show promise for application as fluorescent dyes for cell staining.
Article
Chemistry, Physical
Sami Ullah, Yu Liu, Maria Hasan, Wenwen Zeng, Qitao Shi, Xiaoqin Yang, Lei Fu, Huy Q. Ta, Xueyu Lian, Jingyu Sun, Ruizhi Yang, Lijun Liu, Mark H. Rummeli
Summary: Graphene doping is a promising technology that can enhance graphene properties, improve performance, and expand applications in fields such as hydrogen storage, gas sensors, etc.
Article
Chemistry, Physical
Chamseddine Bouhafs, Sergio Pezzini, Fabian R. Geisenhof, Neeraj Mishra, Vaidotas Miseikis, Yuran Niu, Claudia Struzzi, R. Thomas Weitz, Alexei A. Zakharov, Stiven Forti, Camilla Coletti
Summary: The study successfully synthesized rhombohedral graphene with a thickness of up to 9 layers, with alternating crystal domains identified in Raman spectroscopy. Microscopic and spectroscopic analyses suggest that rhombohedral-stacking formation is correlated to underlying copper step-bunching.
Article
Chemistry, Multidisciplinary
Nan Hong, Dmitry Kireev, Qishen Zhao, Dongmei Chen, Deji Akinwande, Wei Li
Summary: A roll-to-roll (R2R) dry transfer process is developed for large-scale graphene grown by chemical vapor deposition, achieving the lowest electrical sheet resistance ever reported among R2R dry transferred graphene samples. The scalability and uniformity of the R2R dry transferred graphene is demonstrated by successfully fabricating graphene-based field-effect transistors (GFETs) with near-zero doping level and improved gate leakage current. Field-effect mobility of the R2R dry transferred graphene is determined to be 205 +/- 36 cm(2) V-1.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Bjoern K. Birdsong, Billy W. Hoogendoorn, Fritjof Nilsson, Richard L. Andersson, Antonio J. Capezza, Mikael S. Hedenqvist, Stefano Farris, Antonio Guerrero, Richard T. Olsson
Summary: Graphene oxide (GO) was used as a template to synthesize silicon oxide (SiOx) based 2D-nanomaterials with similar morphological features as the GO sheets. By controlled condensation reaction with low concentrations of GO, 2D-nanoflakes consisting of GO-flakes coated with a silica precursor were obtained. The GO template was fully removable without affecting the nanoflake morphology, providing a method for large-scale preparation of SiOx-based 2D nanosheets.
Article
Chemistry, Multidisciplinary
Wenqian Yao, Jianing Zhang, Jie Ji, He Yang, Binbin Zhou, Xin Chen, Peter Boggild, Peter U. Jepsen, Jilin Tang, Fuyi Wang, Li Zhang, Jiahui Liu, Bin Wu, Jichen Dong, Yunqi Liu
Summary: This study presents a new method for synthesizing large-scale pure single-crystalline graphene monolayers on Cu(111) surface. By selectively etching bottom multilayered graphene, the method ensures high electronic quality and enhances the efficiency of graphene production.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Jiaqi Wu, Lei Zhang, Jinxing Long, Qiang Zeng, Biaolin Yin, Xuehui Li
Summary: This study presents the design and synthesis of four novel fluorescent ionic liquids through a simple reaction process. The synthesized ionic liquids were extensively characterized and their photophysical properties were determined. The results reveal that these ionic liquids exhibit dual or triple emissions, large stokes shift, and mechanochromic behaviors.
GREEN ENERGY & ENVIRONMENT
(2022)
Review
Chemistry, Multidisciplinary
Meihui Wang, Da Luo, Bin Wang, Rodney S. Ruoff
Summary: Breakthroughs have been made in the mass production of graphene using CVD, with recent progress in growing large-area single crystal graphene. Challenges remain in achieving uniform bilayer or multilayer graphene single crystals over a large area, but the layer-by-layer transfer method shows promise for creating new types of crystals with specific layer numbers and stacking angles.
TRENDS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Yuan Zhang, Wenqiang Hou, Rui Chang, Xianghua Yao, Youlong Xu
Summary: In this study, an efficient electrochemical intercalation-based exfoliation method was proposed to synthesize high-quality graphene on a large scale. The method produced high-yield graphene nanosheets with high purity and excellent electrical properties. By improving the manufacturing technique, the production efficiency was significantly increased, and the cycling performance was excellent. The development of this method is of great significance for large-scale manufacture and industrial applications of graphene.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Engineering, Electrical & Electronic
Ankit Verma, V. N. Mishra, Rajiv Prakash
Summary: This article presents a highly selective and responsive hydrogen sulfide (H2S) gas sensor operated at room temperature (25 degrees C), which is based on a poly(3-hexylthiophene-2,5-diyl) (P3HT)/graphene quantum dot (GQD) nanocomposite as the sensing surface. The GQD, with an average size of about 2 nm, is distributed randomly on the P3HT film, leading to an enhanced charge transfer mechanism and surface area/volume (S/V) ratio. The sensing film is developed through a solution-processed floating-film transfer (FTM) method on a SiO2-coated p(++) Si substrate, and its sensing performance is investigated with varying H2S gas concentrations from 0 to 25 ppm. The P3HT/GQD-based organic thin-film transistor (OTFT) shows better sensing responses compared to the pristine P3HT-based OTFT, with a sensing response of approximately 91% at 25 ppm.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ankit Verma, V. N. Mishra, Rajiv Prakash
Summary: A self-assembled, fully solution-processed bilayer (TiO2/HfO2) dielectric-based thin film transistor (TFT) was fabricated for highly sensitive ammonia gas detection at room temperature. The bilayer dielectric film, grown over a boron-doped silicon substrate, exhibited high areal capacitance, low roughness, low leakage current density, and a high dielectric constant, which are favorable for high-performance organic TFTs. The incorporation of a TiO2 layer improved the capacitance and reduced roughness of the bilayer dielectric film, enhancing the charge transfer mechanism. The developed high-k bilayer solution-processed dielectric layer was successfully used to develop a low voltage operated OTFT for ammonia gas detection, showing a rapid response and high sensing response.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Energy & Fuels
Mahatim Singh, Saurabh Kumar, Rakesh Mondal, Preetam Singh, Rajiv Prakash, Neeraj Sharma
Summary: A novel electrode material consisting of polyanionic-type (PO4)n- polyhedral covalently bonded with Ni-O linkage is proposed for intercalative battery-type hybrid supercapacitors. A highly porous, flake-type KNiPO4 electrode exhibits robust electrochemical performances due to its open framework structure and active participation of the Ni2+/3+ redox couple, allowing for superior pseudocapacitive intercalating charge storage in aqueous KOH electrolyte. In full cell hybrid supercapacitor mode, the KNiPO4 electrode demonstrated high energy density and power density, as well as excellent cyclic stability, making it suitable for various applications including biomedical devices and bulk, grid-level charge storage.
Article
Energy & Fuels
Ajay Kumar, Saurabh Kumar, Subhajit Jana, Rajiv Prakash
Summary: A nanocomposite of polypyrrole and Ni-doped NASICON-structured Na3NixFe(2-x)(PO4)(SO4)2 has been synthesized using a simple chemical oxidative polymerization method, exhibiting remarkable hydrogen evolution reaction activity. The nanocomposite shows comparable catalytic performance to polymer-based catalysts and offers high current density at lower overpotential, along with exceptional environmental and catalytic stability.
Article
Engineering, Electrical & Electronic
Prashant Kumar, Vishwambahar Nath Mishra, Rajiv Prakash
Summary: This study reports water-induced Lithium oxide (LiOx) based Organic field effect transistors with operating voltage under -2 V, which utilize the floating film transfer method and a self-assembled poly [2,5-(2-octyldodecyl)-3,6-diketopyrrolopyrrole-alt-5,5-(2,5-di(thien-2-yl)thieno [3,2-b]-thiophene)] (DPP-DTT) semiconducting layer. The devices exhibit good performance, including high saturation mobility, low threshold voltage, and low subthreshold swing. The synthesis process is low cost and eco-friendly, using deionized water as the precursor solution of lithium oxide without toxic additives. The LiOx based dielectric also shows good characteristics, such as low leakage current and high capacitance.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Prashant Kuamr, Vishwambhar Nath Mishra, Rajiv Prakash
Summary: We have developed a highly sensitive and selective room temperature operated NO2 gas sensor based on DPP-DTT OFETs. By using water-induced AlOx as the gate dielectric and FTM with water as a liquid substrate, we achieved a response of 2217.4% for 200 ppb and 8445.5% for 1.4 ppm of NO2. The sensor also showed a response and recovery time of 34 and 168 s for 1.4 ppm NO2, with a maximum temperature during fabrication process below 260 degrees C. Selectivity study with other gases confirmed the high selectivity of the sensor for NO2.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ankit Verma, Shipra Gupta, V. N. Mishra, Rajiv Prakash
Summary: This study focuses on the fabrication and characterization of a low-voltage, flexible organic thin film transistor (OTFT) for ammonia sensing. The device utilizes a hybrid dielectric layer and a polymer/2-D nanocomposite as the gate oxide and active layer respectively. The results show that the fabricated device has good electrical characteristics and can detect ammonia gas at low concentrations.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Ankit Verma, Dharmendra Kumar, V. N. Mishra, Rajiv Prakash
Summary: A low-cost floating film transfer method was used to fabricate a gold-doped poly(3-hexylthiophene-2,5diyl) (P3HT)-based low-voltage organic thin-film transistor (OTFT) for white light sensing. The fabrication process involved solution-processed spin casting for high-k dielectric growth and a floating film transfer method for metal nanoparticle-doped organic semiconductor growth. The resulting OTFT showed high crystallinity, self-assembly, and cost-efficiency compared to conventional film deposition techniques. The device exhibited high photosensitivity, photoresponsivity, and detectivity, as well as low response/recovery time, making it suitable for white light sensing applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Prashant Kumar, Vishwambhar Nath Mishra, Rajiv Prakash
Summary: This article presents ultralow-voltage operable organic field effect transistors (OFETs) using a bilayer dielectric made of lithium oxide (LiOx) and aluminum oxide (AlOx). The use of water instead of toxic organic solvents for processing the dielectrics is demonstrated. A donor acceptor-based p-type polymer, poly[2,5-(2-octyldodecyl)-3, 6-diketopyrrolopyrrole-alt-5,5-(2,5di(thien-2-yl)thieno [3,2-b] -thiophene)] (DPP-DTT), is employed as the organic semiconducting layer. The OFET device shows good performance with a high ON/OFF ratio and operability under -1 V.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
Aniruddha Jaiswal, Rajeev Kumar, Rajiv Prakash
Summary: In this study, a pyrolytically derived iron-based nonprecious metal catalyst, Fe3C embedded in heteroatom (S,N)-codoped carbon matrix, was investigated as a potential catalyst for oxygen reduction in alkaline media. The catalyst was carefully characterized for its structure, crystallite size, morphology, dopant bonding states, and defect levels. Optimization of reaction temperature and dopant amounts in the Fe3C@C nanostructures was carried out. Among the different variants, Fe3C@C-SN/25800 exhibited the best electrocatalytic activity with a positive onset potential and low half-wave potential. The presence of Fe-Nx and Nx-C active sites and the suitable alignment of heteroatoms in the carbon matrix contributed to the enhanced performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Rajpal, Ashish Kumar, Subhajit Jana, Priya Singh, Rajiv Prakash
Summary: In this work, a fluorescent probe based on Ce-EDTA coordination complex was developed for sensing carboxyl compounds. Ce-EDTA was synthesized using a hydrothermal method and characterized by FT-IR, XPS, and UV-visible spectroscopy. The probe showed high sensitivity and selectivity towards Lys and AA, and could be applied for their detection in real samples as well.
MATERIALS ADVANCES
(2022)
Article
Chemistry, Inorganic & Nuclear
Saurabh Kumar, Rakesh Mondal, Rajiv Prakash, Preetam Singh
Summary: This article presents a transition metal-based polyanionic layered material, NaCr(SO4)(2), as an electrode material with low cost and high stability for energy storage. The material shows superior performance in terms of charge/discharge capacity for sodium-ion and lithium-ion batteries.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Asha Gupta, Vishal Kushwaha, Rakesh Mondal, Abhay Narayan Singh, Rajiv Prakash, K. D. Mandal, Preetam Singh
Summary: Pseudocapacitors with high energy and high power are suitable for grid-scale electrochemical energy storage. SrFeO3-delta, a perovskite-structured material, is proposed as a negative electrode for overcoming performance degradation in electrochemical pseudocapacitors based on transition-metal oxides. SrFeO3-delta exhibits high specific capacitance and excellent cyclic stability, making it an economical and abundant pseudocapacitive electrode.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Saurabh Kumar, R. Ranjeeth, Neeraj Kumar Mishra, Rajiv Prakash, Preetam Singh
Summary: This study successfully synthesized a Na3Fe2PO4(SO4)(2) material in a NASICON framework structure and investigated its performance as a cathode for sodium-ion batteries. The experimental results demonstrate that the battery shows good cycling stability and high columbic efficiency in the voltage range of 2-4.2 V.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Chandra Jeet Verma, Priya Singh, Ravi Prakash Ojha, Rajiv Prakash
Summary: This study discusses a porous 2D carbon-based oxidase mimic for ascorbic acid detection. A high-performance 2D carbon material was prepared using water hyacinth biomass waste as a precursor. The material exhibited rapid oxidase-like activity due to its high surface area and N, O-doped hierarchical pores. A colorimetric technique based on the 2D carbon oxidase nanozyme was developed for ascorbic acid sensing.
MATERIALS ADVANCES
(2022)
