Article
Engineering, Electrical & Electronic
Junliang Zhang, Shuyi Ma, Bingji Wang, Shitu Pei
Summary: The composite SnO2/CuO nanotubes were prepared by uniaxial electrospinning, which showed excellent selectivity for ethanol. The response value of ethanol had a good linear relationship with concentration, indicating potential for gas sensing applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Junliang Zhang, Shuyi Ma, Bingji Wang, Shitu Pei
Summary: The SnO2-CuO composite nanoparticles fabricated as an ethanol gas sensor exhibit excellent sensitivity and selectivity to ethanol, with short response recovery time and good linear relationship between response value and ethanol concentration, mainly due to the special heterostructure and synergistic effect between tin oxide and copper oxide.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Li Wang, Shuyi Ma, Jianpeng Li, Andong Wu, Didi Luo, Tingting Yang, Pengfei Cao, Nina Ma, Yahui Cai
Summary: This work presents a method for synthesizing Mo-doped SnO2 nanotubes with uniform morphology, which enhances gas adsorption by creating new lattice defects. The optimal doping concentration of transition metal elements is essential for achieving the best sensing response in metal-oxide NTs gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Li Wang, Shuyi Ma, Xiaoli Xu, Jianpeng Li, Tingting Yang, Pengfei Cao, Pengdou Yun, Shengyi Wang, Ting Han
Summary: In this study, terbium-doped SnO2 nanotubes were synthesized and characterized for gas sensing applications. XPS analysis revealed that 7% terbium-doped SnO2 showed the best sensitivity to ethanol at 100 ppm, reaching 53.6 at 200 degrees Celsius. The doping of terbium increased the number of active sites on the surface of SnO2, enhancing gas sensitivity and electrical responsiveness.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Run-Hui Wang, Wei Wen, Shilie Zheng, Zhizhen Ye, Jin-Ming Wu
Summary: In this study, a layered mesoporous aggregate of tin oxide nanocrystals with high specific surface area and mesoporous structure was synthesized. The tin oxide showed high ethanol sensing performance at low temperatures, with high selectivity and stability. The ethanol sensing mechanism changed with increasing operating temperature.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Materials Science, Multidisciplinary
Juan G. Sotelo, Jaime Bonilla-Rios, Fernando Garcia-Escobar, Jose L. Gordillo
Summary: A thin film sensor based on tetragonal SnO2 nanoparticles was fabricated using the sol-gel method and dip-coating technique. The sensing material was produced through a cycling annealing process and low-cost materials were used for the sensor assembly, achieving the advantage of detecting ethanol at lower temperatures.
Article
Chemistry, Analytical
E. Spagnoli, S. Krik, B. Fabbri, M. Valt, M. Ardit, A. Gaiardo, L. Vanzetti, M. Della Ciana, V Cristino, G. Vola, S. Caramori, C. Malagu, V Guidi
Summary: Tungsten oxide nanoflake powders were synthesized using solvothermal technique for ethanol sensing, showing good response to ethanol compared to other alcohols due to an interplay between the catalytic properties of the sensing film and gas diffusivity in a porous medium.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Yong Tan, Jun Zhang
Summary: In this work, an ethanol gas sensor based on Co-doped SnO2 nanobelts was fabricated. The Co-doped SnO2 nanobelts were prepared using chemical vapor deposition method and gas sensors were prepared using powder screen printing technology. The gas sensor based on Co-doped SnO2 nanobelts exhibited better gas response and shorter response time and recovery time compared to the gas sensor based on pure SnO2 nanobelts.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Materials Science, Ceramics
Jian Fang, Xi Chen, Rong-Pu Xiao, Jing-Jing Xue, Ji-Ming Song
Summary: In this study, Pr-SnO2/In(2)O(3) composite material was successfully prepared by synthesis and decoration methods, and it showed good sensing performance for ethanol gas.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Chen Wang, Runlong Li, Lingyan Feng, Jiaqiang Xu
Summary: In recent years, the two-dimensional layered material MXene has gained significant attention in the field of sensors due to its large specific surface area and rich active sites. By preparing SnO2/MXene composites using multilayer Ti3C2TX and SnO2 microspheres, the gas-sensing properties of pristine SnO2 have been enhanced. The composite was used to fabricate low power consumption resistance-type gas sensors on a microelectromechanical system (MEMS) platform. The results showed that the SnO2/MXene sensor with the best composite ratio greatly improved the gas sensitivity of SnO2 sensor, particularly to ethanol gas. The composite also accelerated the response recovery speed of the sensor.
Article
Nanoscience & Nanotechnology
Xiaoyan Song, Fangzheng Zhao, Zhipeng Wang, Runbin Ge, Jinfeng Xing
Summary: In this study, ZnO@SnO2-Pt core-shell nanofibers with a hollow structure were successfully prepared and exhibited superior gas-sensing performance, achieving higher response speed and sensitivity on the basis of reduced operating temperature. Additionally, the gas-sensing mechanism of the nanofibers was discussed in detail.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Qi Zhang, Qian Ma, Xueying Wang, Yi Wang, Dongheng Zhao
Summary: In this study, a series of CeO2/WO2.9 composites with tunable structure and thickness were fabricated by innovating the addition of H2WO4 during the hydrothermal process. The optimal Ce/W-0.25 sensors showed a higher response value of 23.68 to 100 ppm n-butanol at room temperature compared to pure CeO2 (1.26) at 200 degrees C. The unique surface double oxygen defect engineering between CeO2 and WO2.9 played a significant role in gas sensing, the formation of the CeO2-WO2.9 heterojunction, and the effective surface/interface transport mechanism. The electron transfer between WO2.9 and CeO2 facilitated the interconversion between Ce3+ and Ce4+ driven by oxygen defects on the surface of CeO2. This work provides new insights and a facile fabrication pathway for developing novel n-butanol gas sensors with excellent sensing performance at room temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Huiqing Fan, Xiaokun Zheng, Qi Shen, Weijia Wang, Wenqiang Dong
Summary: A hierarchical SnO2 nanosheet structure loaded with Pt nano quantum dots was prepared and exhibited high gas sensitivity and excellent response and recovery behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Analytical
Liupeng Zhao, Yiwen Li, Yue Zhou, Tianshuang Wang, Peng Sun, Fangmeng Liu, Chenguang Wang, Xu Yan, Nianke Chen, Geyu Lu
Summary: The effect of high- and low-valence doping on adsorbed oxygen has been studied and a core-shell structure combining the advantages of both dopants has been designed and prepared to enhance oxygen adsorption and resistance change.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Long Chen, Haozhou Shi, Chenjia Ye, Xiaoyu Xia, Yi Li, Chenying Pan, Yanhua Song, Jun Liu, Hao Dong, Di Wang, Xing Chen
Summary: Au decorated In-doped SnO2 porous nanotubes were fabricated and showed good ethanol sensing properties. The 3% mol Au decorated In-doped SnO2 porous nanotubes had high response to ethanol and could detect ethanol down to 50 ppb at a low working temperature of 150 degrees C. The gas sensor also demonstrated high selectivity, reversibility, and long-term stability, attributed to factors such as oxygen vacancies, catalytic activity of Au nanocatalysts, and porous structures.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Ryunosuke Okuda, Koichi Suematsu, Ken Watanabe, Kengo Shimanoe
Summary: A chitosan-derived nitrogen-doped carbon (NDC) with a well-designed pore structure is prepared using a novel activation process with ZnO and water vapor. The obtained NDC gas diffusion electrode for oxygen reduction exhibits higher performance than a Pt/carbon black electrode in the current density range of 1-500 mA/cm(2).
Article
Electrochemistry
Ryunosuke Okuda, Kota Nakano, Koichi Suematsu, Ken Watanabe, Anna Ilnicka, Jerzy P. Lukaszewicz, Kengo Shimanoe
Summary: The study fabricated nitrogen-doped carbons derived from chitosan and investigated the effect of activation temperature on their microstructure, showing the importance of controlling activation temperature on performance. Experimental results demonstrated that the microstructure of NDCs plays a key role in electrode performance.
Article
Electrochemistry
Shingo Ide, Ken Watanabe, Koichi Suematsu, Yasuhiro Seto, Isamu Yashima, Kengo Shimanoe
Summary: This study demonstrates the potential of an oxide-ion-conductor-based oxygen pumping system as an on-site oxygen separation system, by observing the oxygen permeation capability in a Pt electrode/L-SDC/L-LSBO solid electrolyte cell. The results show a significant increase in oxygen permeation flux under applied DC voltages, with a remarkably high flux even at 500 degrees C. In situ X-ray diffraction studies reveal the changes in L-SDC under applied voltages, leading to the formation of a mixed electron- and oxide-ion-conducting L-SDC electrode and enhancing oxygen reduction reaction and incorporation.
Article
Materials Science, Multidisciplinary
Chengcheng Liu, Koichi Suematsu, Akihito Uchiyama, Ken Watanabe, Yanbao Guo, Deguo Wang, Kengo Shimanoe
Summary: Pd-loaded SnO2 nanoparticles prepared via a new loading method exhibited higher response to low concentrations of methane and better performance at lower operating temperatures. Additionally, the larger size of Pd particles was found to enhance the combustion activity of CH4 in humid conditions.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Keita Omiya, Yuya O. Nakagawa, Sho Koh, Wataru Mizukami, Qi Gao, Takao Kobayashi
Summary: Understanding photochemical reactions is crucial for various biochemical phenomena and the development of functional materials. Utilizing quantum computers to analyze these reactions is a promising approach to overcome the computational challenges. By extending theories and evaluating analytical gradients, quantum computers show potential in studying photochemical reactions and capturing important characteristics such as conical intersections.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2022)
Article
Materials Science, Multidisciplinary
Yongjiao Sun, Zhenting Zhao, Koichi Suematsu, Pengwei Li, Wendong Zhang, Jie Hu
Summary: In this study, metal-organic frameworks (MOF) with different Zn and Ni ratios were synthesized without surfactant, leading to the formation of ZnO-NiO materials. Among them, ZNO-5 exhibited excellent acetone sensitivity and water-vapor resistance in high-humidity environments.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Analytical
Yongjiao Sun, Zhenting Zhao, Rui Zhou, Pengwei Li, Wendong Zhang, Koichi Suematsu, Jie Hu
Summary: The study successfully prepared different sizes of cubic indium oxide nanocube clusters and their composites with Au nanoparticles using a solvothermal method, demonstrating that the Au@In2O3 system exhibits the best sensing properties. The Au nanoparticles enhance the receptor function of the semiconductor gas sensor, leading to increased sensing response.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Multidisciplinary
Hirotaka Koga, Kazuki Nagashima, Koichi Suematsu, Tsunaki Takahashi, Luting Zhu, Daiki Fukushima, Yintong Huang, Ryo Nakagawa, Jiangyang Liu, Kojiro Uetani, Masaya Nogi, Takeshi Yanagida, Yuta Nishina
Summary: Semiconducting nanomaterials with 3D network structures possess various attractive properties, but their structural design and electrical conductivity tunability are limited. To address this issue, a pyrolyzed cellulose nanofiber paper (CNP) semiconductor with a 3D network structure is proposed, which achieves nano-micro-macro trans-scale structural design and wide and systematic tunability of electrical conductivity.
Article
Chemistry, Physical
K. Miyanishi, W. Mizukami, M. Motoyama, N. Ichijo, A. Kagawa, M. Negoro, M. Kitagawa
Summary: In this study, the lifetimes of nuclear spin states composed of proton spin pairs were predicted using the molecular dynamics method and quantum chemistry simulations. Various interactions were considered, and the calculated values matched the experimental results. This research provides insights for the molecular design of NMR applications and predicting the nuclear spin relaxation time of synthetic molecules in advance.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Analytical
Koichi Suematsu, Akihito Uchiyama, Ken Watanabe, Kengo Shimanoe
Summary: This study focused on developing a highly sensitive carbon monoxide sensor with wide humidity resistance by exploring the Pd loading method on SnO2 nanoparticles and the thickness of the sensing layer. The results indicated that the sensor prepared using the colloidal protection method for Pd loading showed better performance, and a thinner sensing layer design could improve sensor response and stability to humidity changes.
Article
Physics, Applied
Luca Erhart, Kosuke Mitarai, Wataru Mizukami, Keisuke Fujii
Summary: This paper discusses the performance of the deep VQE algorithm applied to quantum chemistry problems and investigates different subspace forming methods. The results show that the deep VQE algorithm can simulate the electron-correlation energy of the ground state and achieve chemical accuracy in some cases.
PHYSICAL REVIEW APPLIED
(2022)
Article
Nanoscience & Nanotechnology
Yongjiao Sun, Baoxia Wang, Bingliang Wang, Zhenting Zhao, Wenlei Zhang, Wendong Zhang, Koichi Suematsu, Jie Hu
Summary: In this study, novel flower-like PtOx@ZnO/In2O3 hollow microspheres were prepared and systematically evaluated for their gas sensing performances. The ZnIn2 sensor presented a higher response, which was further enhanced by modifying it with PtOx nanoparticles. The Pt@ZnIn2 sensor exhibited outstanding isopropanol detection performance with high response values under different humidity levels.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Multidisciplinary
Shigeo Hakkaku, Yuichiro Tashima, Kosuke Mitarai, Wataru Mizukami, Keisuke Fujii
Summary: This paper proposes a measure called fermionic nonlinearity to quantify the classical simulatability of quantum circuits designed for simulating fermionic Hamiltonians. The authors calculate the upper bound of the fermionic nonlinearity of a rotation gate and estimate the sampling costs of unitary coupled cluster singles and doubles quantum circuits under the dephasing noise. The results show that there are regions where the fermionic nonlinearity becomes very small or unity, indicating the classical simulatability of the circuits. The authors believe that these methods and results can help design quantum circuits for fermionic systems with potential quantum advantage.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Quantum Science & Technology
Keisuke Fujii, Kaoru Mizuta, Hiroshi Ueda, Kosuke Mitarai, Wataru Mizukami, Yuya O. Nakagawa
Summary: We propose a divide-and-conquer method for quantum-classical hybrid algorithm to solve larger problems using small-scale quantum computers. The method combines a variational quantum eigensolver with a reduction in system dimension.
Article
Physics, Multidisciplinary
Nobuyuki Yoshioka, Takeshi Sato, Yuya O. Nakagawa, Yu-ya Ohnishi, Wataru Mizukami
Summary: In this paper, we present a quantum-classical hybrid algorithm for simulating electronic structures of periodic systems. By extending the unitary coupled cluster (UCC) theory and using the quantum subspace expansion method, we successfully optimized the UCC ansatz and computed the quasiparticle band structure.
PHYSICAL REVIEW RESEARCH
(2022)