Article
Chemistry, Physical
Da Eun Choi, Jaemin Im, Yejin Ahn, Kyoungtae Hwang, Jungwon Kim, Ji Eon Kwon, Sang Kyu Park, Hyun Ho Choi, Bong-Gi Kim
Summary: By wrapping a conjugated polymer with excellent molecular doping ability, PIDFBT, onto the surface of single-walled carbon nanotubes (SWCNTs) and doping it with AuCl3, the PIDFBT@SWCNT achieves both excellent solution dispersibility and high electrical conductivity of over 5000 S cm(-1). Spectroscopic analysis and four-probe field-effect transistor measurements confirm a carrier mobility of up to 138 cm(2) V-1 s(-1). The doping mechanism controls the carrier transfer barrier energy related to the Schottky barrier between SWCNT and PIDFBT.
Article
Nanoscience & Nanotechnology
Saiyin Hou, Haiqi Chen, Dong Lv, Wei Li, Xuelei Liu, Qiang Zhang, Xinhong Yu, Yanchun Han
Summary: Inkjet-printed conductive polymer PEDOT:PSS films have been developed as stretchable transparent electrodes in optoelectronic devices. By printing a formulated ink containing PEDOT:PSS, formamide, d-sorbitol, sodium dodecyl benzene sulfonate, and ethylene glycol, a uniform film with high conductivity and mechanical performance is achieved. The film shows a high conductivity of 1050 S/cm, sheet resistance of less than 145 omega/sq, and can maintain stability even after 200 cycles of stretching at 55% strain. The enhanced conductivity is due to the conformational transition of the backbone through secondary doping and post-treatment with formamide, as well as the removal of excess PSS components after phase separation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Sihui Deng, Jian Liu, Bin Meng, Jun Liu, Lixiang Wang
Summary: This study examines the impact of the molecular weight of an n-type conjugated polymer on molecular doping and thermoelectric parameters. It is found that a higher molecular weight leads to better compatibility with the dopants, resulting in more charge carriers.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Giuseppe Valerio Bianco, Alberto Sacchetti, Marco Grande, Antonella D'Orazio, Pio Capezzuto, Giovanni Bruno
Summary: Research has explored a graphene doping method that combines covalent and non-covalent doping to increase carrier charge density without significantly affecting mobility, providing graphene materials that meet technical requirements for several industrial applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Abhay Ram Balakrishnan, R. Shankar, S. Vijayakumar
Summary: Metal complexes of the form C5H5N -[C---N]-X-[C---C]n- C5H5N, where X = Ag, Au, Co, Cu and n = 1,2,3, were studied using Density Functional Theory methods to analyze their structural and conducting properties. The study found that pyridine terminated metal complexes showed significantly increased HOMO energies leading to lower transport barriers, as well as notably reduced HOMO-LUMO energy gaps compared to previous reports of polyyne chains. Additionally, positively charged polyyne-metal complexes exhibited a larger reduction in BLA.
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Qi Wang, Jincang Su, Hailun Chen, Deqiang Wang, Xiaoyu Tian, Yujian Zhang, Xin Feng, Shun Wang, Jun Li, Huile Jin
Summary: The increased degree of graphitization is commonly accepted to enhance the electrical conductivity of carbon materials. However, heteroatom doping on carbon host can also improve the conductivity by contributing to higher charge delocalization and density of donor states near Fermi level. This study demonstrates that nitrogen-doped carbon with finely designed structure exhibits an electrical conductivity over 3.5 times higher than commercial carbon conductors, making it a promising conductive agent-free electrode material for all-solid-state flexible supercapacitors.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Siyi Luo, Zhen Xu, Fei Zhong, Hui Li, Lidong Chen
Summary: This review article revisits the fundamental principles and characterization methods of charge transfer mechanisms in molecular doping of organic semiconductors. It highlights the key points for the formation of integer charge transfer (ICT) and charge transfer complex (CTC) from both molecular structure and process engineering aspects. The strategies to improve the proportion of ICT are discussed, and the challenges and perspectives for future developments in molecular doping of polymer semiconductors are provided.
CHINESE CHEMICAL LETTERS
(2024)
Article
Materials Science, Multidisciplinary
Junhee Lee, Honghyuk Kim, Lakshay Gautam, Manijeh Razeghi
Summary: A highly conductive gallium oxide doped with silicon and indium was grown on a c-plane sapphire substrate using MOCVD. The material exhibited high electron hall mobility and carrier concentration when doped with silicon, but was highly resistive without silicon doping. Indium was found to play a role in passivating electron trapping defect levels in the material.
Article
Chemistry, Physical
Sanjayan Sathasivam, Sapna D. Ponja, Seonghyeok Park, Clara Sanchez-Perez, Christopher Blackman, Ivan P. Parkin, Claire J. Carmalt
Summary: Alternatives to tin-doped indium oxide transparent electrodes are required. Tungsten-doped SnO2 thin films with low resistivities and high electron mobilities were obtained using chemical vapor deposition. The tungsten dopant had minimal distortion to the SnO2 unit cell and resulted in crystallographic preferential orientation in the [200] direction. X-ray photoelectron spectroscopy analysis indicated that tungsten was present in the +5 state, minimizing ionized impurity scattering and achieving high electron mobilities. The tungsten-doped films had an optical band gap of 3.7 eV, making them transparent to visible light.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Cong Liao, Chuang Yu, Shuai Chen, Chaochao Wei, Xuefei Miao, Shijie Cheng, Jia Xie
Summary: This study developed a design strategy of Sn-Cl dual doping to improve the ionic conductivity and lithium metal compatibility of Li6PS5I solid electrolytes. The optimal Li6.6P0.8Sn0.2S5I0.6Cl0.4 electrolyte exhibited ultrahigh conductivity (up to 0.96 mS/cm) and enhanced lithium metal compatibility. The assembled battery using LiNi0.6Mn0.2Co0.2O2 cathode and Li-In anode showed high initial discharge capacity (175.7 mAh/g at 0.1C) and maintained 79.2% after 100 cycles.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Min Li, Tao Wang, Xiang-Le Liu, Ze-Long Bao, Peng-Fei Qian, Kun Liu, Yaling Shi, Xianbing Ming, Hong-Zhang Geng
Summary: Transparent conductive films (TCFs) with PTA/Au secondary p-type doped SWCNTs as a conductive layer were prepared and employed as heating devices. The films showed excellent optoelectronic properties, mechanical properties, stability, and electrical heating properties. Transparent flexible heaters (TFHs) made of PTA/Au dual p-type doped SWCNT TCFs demonstrated quick response to temperature changes and outstanding cycling stability.
Article
Chemistry, Multidisciplinary
Shun Watanabe, Ryohei Hakamatani, Keita Yaegashi, Yu Yamashita, Han Nozawa, Mari Sasaki, Shohei Kumagai, Toshihiro Okamoto, Cindy G. Tang, Lay-Lay Chua, Peter K. H. Ho, Jun Takeya
Summary: A highly periodic electrostatic potential is crucial for coherent band electron systems in van der Waals bonded organic crystals. Impurity doping faces difficulties in molecular crystals due to the destruction of ordered molecular frameworks, but a versatile strategy allows for the creation of coherent 2D electronic carriers at the surface of organic semiconductor crystals while preserving precise molecular structures. By forming redox-active molecular dopants on a molecularly flat crystalline surface through a simple solution process, efficient chemical doping and high carrier density can be achieved at room temperature, resulting in excellent carrier transport properties and piezoresistive effects similar to those in bulk crystals.
Article
Materials Science, Ceramics
G. Colibaba, D. Rusnac, V Fedorov, P. Petrenko, E. Monaico
Summary: A new technology for sintering ZnO + Ga2O3 powder via chemical vapor transport based on HC1 has been developed, which offers advantages such as low sintering temperature, elimination of expensive dopant nanopowders, possibility of multiple re-sintering, and stability in ceramic diameter after sintering. Additionally, ZnO:Ga:Cl ceramics with specific properties have been synthesized, and ZnO:Ga:Cl thin films with desired resistivity can be grown using DC magnetron sputtering of the synthesized ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Jun Han, Dian-sen Li, Lei Jiang, Dai-ning Fang
Summary: Co-MnO2 shows excellent electrochemical properties as the cathode electrode of sodium-ion and potassium-ion batteries, with Co-doping facilitating ion transport acceleration and stabilizing the crystal structure of MnO2. A gel-type supercapacitor combining Co-0.2-MnO2, KOH, and PVA demonstrates high conductivity, mechanical endurance, and ideal capacitive behavior, with stable longevity after 500 cycles, promoting the integration of flexible energy storage fabric devices.
Article
Engineering, Electrical & Electronic
Qianyu Wang, Hua Yuan, Mingyue Zhang, Nana Yang, Shaoling Gong, Hui Zhao, Xiaoqin Wang, Shanxin Xiong, Kanshe Li, Anning Zhou
Summary: A highly dispersed MXene/N-CNT composite material was constructed by elaborately assembling a MXene-Co-melamine precursor via coordination bonds and subsequent pyrolysis. The optimized 0.60-MXene/N-CNT exhibited abundant and homogeneous CNTs, high nitrogen dosage, and a well-matched hierarchical pore structure, resulting in high specific capacitance, capacitance retention, and energy density.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Shingo Urata, Nobuhiro Nakamura, Tomofumi Tada, Aik Rui Tan, Rafael Gomez-Bombarelli, Hideo Hosono
Summary: This study used molecular dynamics simulations to investigate the effectiveness of codoping boron and fluorine in improving the homogeneity of silica glass. It was found that adding a small amount of boron and fluorine can reduce the density fluctuation of the glass and improve its homogeneity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Keiga Fukui, Soshi Iimura, Albert Iskandarov, Tomofumi Tada, Hideo Hosono
Summary: In this study, we report a lightly oxygen-doped lanthanum hydride with high H- conductivity at room temperature, which is three orders of magnitude higher than the best conductor. The oxygen concentration is crucial for achieving fast H- conduction near room temperature, with a low activation barrier only observed for x < 0.25.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Albert Iskandarov, Tomofumi Tada, Soshi Iimura, Hideo Hosono
Summary: This article introduces the potential of solid hydrides as ionic conductors and reveals the H- diffusion mechanism in LaH2.5O0.25. The study shows that the formation of mobile vacancies leads to anomalously large entropy and pre-exponential factor. In addition, the anharmonicity of H- vibrations also affects the pre-exponential factor. The article also proposes a design concept for a faster H- conductor based on these findings.
Article
Chemistry, Inorganic & Nuclear
Masahisa Osawa, Sakie Soma, Hiroyuki Kobayashi, Yuya Tanaka, Mikio Hoshino
Summary: Three cationic dinuclear Au(I) complexes with acetonitrile as an ancillary ligand were synthesized and their structures were determined. Luminescence studies revealed different fluorescence properties in the crystalline state, with complex 3 showing dual phosphorescence. The phosphorescence properties of complexes 2 and 3 at different temperatures were investigated using theoretical calculations and photophysical data.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yuya Tanaka, Aki Okamoto, Shintaro Fujii, Tomoaki Nishino, Munetaka Akita
Summary: In this study, a new organometallic molecular wire was designed and its electrochemical properties and single-molecule conductance were investigated experimentally and computationally. The results show that the molecular wire exhibits excellent conductivity and can be connected to gold electrodes through C-H activation and formation of Au-C bonds.
INORGANICA CHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Yuya Tanaka
Summary: Single-molecule junctions and self-assembled monolayer junctions are attractive for thermoelectric devices. However, high conductance and Seebeck coefficient values are desired for better performance. Metal complexes show promise as active components due to their modulatable transmission functions, influencing conductance and Seebeck coefficient. This article describes recent studies on metal complex junctions for thermoelectric measurements and discusses their potential use in devices.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Editorial Material
Chemistry, Organic
Munetaka Akita, Paola Ceroni, Corey R. J. Stephenson, Geiraldine Masson
JOURNAL OF ORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Yuya Tanaka, Yeana Bae, Fumiya Ogasawara, Keita Suzuki, Shuji Kobayashi, Satoshi Kaneko, Shintaro Fujii, Tomoaki Nishino, Munetaka Akita
Summary: Precise control of molecule-electrode interface is achieved by designing ruthenium acetylide molecular wires with long-legged phosphine ligands, allowing for sterically controlled molecule-electrode interface. The observation of sharpened Raman signals for acetylene stretching in the self-assembled monolayers suggests the formation of uniform SAMs due to steric hindrance. Scanning tunneling microscope break-junction study reveals narrow conductance features, indicating a uniform molecular junction and effective electronic interactions unique to the long-legged derivatives.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Multidisciplinary Sciences
Yoshiaki Shoji, Ryo Komiyama, Miki Kobayashi, Atsuko Kosaka, Takashi Kajitani, Rie Haruki, Reiji Kumai, Shin-ichi Adachi, Tomofumi Tada, Naoyuki Karasawa, Hiroshi Nakano, Hisao Nakamura, Hidehiro Sakurai, Takanori Fukushima
Summary: Inspired by stacked teacups, we synthesized a hexagonal columnar mesophase with bowl-shaped molecules that exhibit unexpected softness. The combination of higher structural order and mechanical softness could lead to the development of higher-order liquid crystals with unique mechanical and stimuli-responsive properties.
Article
Chemistry, Multidisciplinary
Kazuki Toyama, Yuya Tanaka, Michito Yoshizawa
Summary: A ferrocene-based capsule is formed in water by the assembly of bent amphiphiles carrying two ferrocene units and can be disassembled and assembled in a reversible manner through chemical redox stimuli. This capsule efficiently encapsulates organic/inorganic dyes and electron-accepting molecules in water, exhibiting unique host-guest charge-transfer interactions. These encapsulation-induced interactions can be released through the disassembly of the capsule by a redox stimulus.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Hayate Suzuki, Yoshimori Akiyama, Masahiro Yamashina, Yuya Tanaka, Shinji Toyota
Summary: This study reports a straightforward transformation of highly hydrophobic triarylphosphines into amphiphiles via the Staudinger reaction. The obtained amphiphiles are remarkably water-soluble and can self-assemble into 2 nm-sized micelles in water. These amphiphiles can also solubilize various hydrophobic organic dyes in water, resulting in monomer or excimer emissions.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Physical
Masateru Taniguchi, Takahito Ohshiro, Tomofumi Tada
Summary: Genomic information is crucial for human health and can potentially be computed using rapidly developing quantum computers. Genome analysis using quantum computers has the potential to accelerate the development of personalized medicine, innovative drugs, and novel diagnostics. In this study, we demonstrated the identification of nucleotides using a quantum computer and designed a quantum gate that can distinguish adenosine among the four nucleotides. Our findings represent the first step towards realizing genome analysis using quantum computers.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Multidisciplinary Sciences
Jiang Li, Jiazhen Wu, Sang-won Park, Masato Sasase, Tian-Nan Ye, Yangfan Lu, Masayoshi Miyazaki, Toshiharu Yokoyama, Tomofumi Tada, Masaaki Kitano, Hideo Hosono
Summary: This research discovers that the topological insulator bismuth selenide can serve as an efficient catalyst for the oxidative carbonylation reaction to synthesize urea derivatives at low temperatures. The topological surface states of bismuth selenide facilitate the activation of dioxygen, leading to higher reaction activity and yield compared to noble metal catalysts.
