Article
Chemistry, Analytical
Amanzhol Turlybekuly, Madina Sarsembina, Almagul Mentbayeva, Zhumabay Bakenov, Baktiyar Soltabayev
Summary: A highly sensitive N2O gas sensor operating at room temperature has been developed using CuO/TiO2 heterojunctioned nano-interfaces, demonstrating outstanding response and recovery times and an excellent detection limit at ultra-low concentrations.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Wansik Oum, Ali Mirzaei, Tanveer Hussain, Jae Hoon Bang, Seungmin Han, Ka Yoon Shin, Dong Jae Yu, Sukwoo Kang, Thanayut Kaewmaraya, Sang Sub Kim, Hyoun Woo Kim
Summary: In this study, we enhanced the sensing performance of TeO2 by depositing amorphous carbon (a-C) on its surface. The a-C-decorated sensor exhibited a lower optimized sensing temperature, higher sensitivity to NO2 gas, and outstanding selectivity. The findings were further confirmed through density functional theory (DFT) calculations.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Tae-Hee Han, So-Young Bak, Sangwoo Kim, Se Hyeong Lee, Ye-Ji Han, Moonsuk Yi
Summary: This paper introduces a method to enhance the sensitivity of a p-type metal oxide semiconductor gas sensor to NO2 gas by decorating CuO nanowires with ZnO nanoparticles. The CuO/ZnO gas sensor showed better sensitivity to NO2 gas compared to the pristine CuO gas sensor. The study demonstrated that adjusting the width of the HAL could improve the NO2 sensing characteristics of the gas sensor.
Article
Chemistry, Analytical
Yunkun Shen, Kaili Wang, Hao Liu, Liping Chen, Zhihan Jin, Shancheng Yan, Vincenzo Guidi
Summary: This study presents an efficient NO2 sensor using TeO2 nanowires, which offers reduced recovery times and improved sensitivity. The sensor has a unique surface and smooth structure, allowing for quick adsorption and release of NO2 gas. This approach has the potential to enhance sensor performance in other systems.
Article
Chemistry, Multidisciplinary
Kyeorei Lim, Young-Moo Jo, Ji-Wook Yoon, Jun-Sik Kim, Dong-Jae Lee, Young Kook Moon, Ji Won Yoon, Jae-Hyeok Kim, Hun Ji Choi, Jong-Heun Lee
Summary: Transparent nanopatterned chemiresistors composed of aligned 1D Au-SnO2 nanofibers demonstrated highly selective detection of toxic NO2 gas at room temperature under visible light illumination. The sensors, with extremely low coverage of sensing materials and high transparency, can detect NO2 at sub-ppm levels with a detection limit as low as 6 ppb. The design, utilizing localized surface plasmonic resonance effect of Au nanoparticles, allows for room-temperature NO2 sensing without the need for external heaters or light sources, opening up new possibilities for transparent oxide-based gas sensors.
Article
Chemistry, Analytical
Enza Panzardi, Nicola Calisi, Nicoleta Enea, Ada Fort, Marco Mugnaini, Valerio Vignoli, Anna Vinattieri, Mara Bruzzi
Summary: The response of resistive In2O3-x sensing devices to different concentrations of NO2 under various operative conditions was investigated. The sensing layers were 150 nm thick films manufactured by oxygen-free room temperature magnetron sputtering deposition, which allowed for easy and fast manufacturing process while providing advantages in terms of gas sensing performances. The oxygen deficiency during growth created high densities of oxygen vacancies that facilitated NO2 absorption reactions on the surface and acted as donors in the bulk. The sensor exhibited a baseline resistance of kilohms and showed remarkable performances in terms of gas sensitivity.
Article
Engineering, Electrical & Electronic
Zhengkun Wu, Yanrong Wang, Peizhe Wang, Xu Cheng, Qiao Wang, Yifan Yang, Yibing Luo, Beixi An, Erqing Xie
Summary: The development of simple and low-cost materials and methods for NO2 sensors is crucial for their commercialization. Au-modified SnO2 nanorods synthesized via hydrothermal method combined with photodeposition exhibit excellent NO2-sensing properties, including high response, low detection limit, and fast response/recovery time at room temperature. The sensor also shows good selectivity, repeatability, long-term stability, and performs well in a high-humidity environment.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Y. H. Navale, S. T. Navale, M. A. Chougule, N. S. Ramgir, V. B. Patil
Summary: This study investigates the selective detection of NO2 gas by CuO/ZnO heterostructured sensors at low temperatures, demonstrating successful detection at 150 degrees Celsius with good response, stability, and reproducibility. The main objective is to understand the interaction between NO2 gas and CuO/ZnO heterostructured sensing materials for the detection of toxic gases.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Jiran Liang, Wenhao Wu, Qun Lou, Kangqiang Wang, Chang Xuan
Summary: The study focused on the preparation of Ag-modified VO2 nanorods using a two-step method to improve NO2 sensing performance at room temperature. The results showed that nanorods annealed at 450 degrees Celsius had the highest sensitivity, reaching a response value of up to 2.54-5 ppm NO2, while the response value decreased as humidity increased. The good sensing performance was attributed to the catalytic effect of Ag nanoparticles and the changing of the energy band gap.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Jinjuan Li, Jing Hu, Nan Li, Miao Cheng, Tao Wei, Qianqian Liu, Ruirui Wang, Wanfei Li, Yun Ling, Yafei Zhang, Bo Liu
Summary: This study successfully prepared Cu2O/CuO@rGO composites via a one-step green synthesis method at room temperature, and developed a gas sensor for NO2 detection at room temperature with ultra-high response and low detection limit.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Phan Hong Phuoc, Nguyen Van Hoang, Nguyen Manh Hung, Pham Tien Hung, Phung Dinh Hoat, Nguyen Van Hieu
Summary: xCuO-(1-x)Fe2O3 composite nanofibers for gas-sensing applications were investigated using on-chip electrospinning. The composite nanofibers showed improved sensor response compared to single metal oxides. The optimal composition of 0.5CuO-0.5Fe2O3 formed a complex oxide of copper ferrite (CuFe2O4) and exhibited the highest response to H2S and NO2 gases. The gas-sensing performance was attributed to the nanograin-based structure, formation of CuFe2O4 oxide, and heterojunctions in the composite nanofibers.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Dinesh Mani, S. Sundar Manoharan, Ganesan Sriram, G. Johnsy Arputhavalli, S. Jebasingh
Summary: Kinematically grown highly oriented hexagonal ZnO nanorods and nanograined films were fabricated on silicon substrates via pulsed laser deposition. The structural, morphological, optical properties, and gas sensing studies of ZnO nanostructured thin film were systematically investigated. The study demonstrated that ZnO nanorods exhibit a greater sensitivity response for the detection of acetaldehyde (CH3CHO) compared to ZnO nanograined films, suggesting their potential as a material for CH3CHO gas detection at room temperature.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Ting-Jen Hsueh, Pao-Sheng Li, Shi-Yan Fang, Cheng-Liang Hsu
Summary: This study produced CuO nanowires using RF sputtering and integrated them into a MEMS structure to form a gas sensor. XRD analysis showed preferred orientation of the CuO NWs. Long term testing demonstrated the sensor's high selectivity to NO2 and stability.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Environmental
Jianhong Zhou, Ke Xue, Yaoda Liu, Tingting Liang, Pengfei Zhang, Xu Zhang, Wentao Zhang, Zhengfei Dai
Summary: In this study, two-dimensional SnS2 nanosheets doped with Mo were synthesized and used for the highly sensitive and selective detection of NO2. The Mo doping significantly enhanced the sensing response and revealed an abnormal p-n sensing transition characteristic.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Jie Li, Pengrong Zheng, Linxi Dong, Weihuang Yang, Chaoran Liu, Yuekun Yang, Zhongying Xue, Guanyu Liu, Panlin Li, Zengfeng Di
Summary: The approach proposed in the article allows for direct growth of graphene on any dielectric substrates through the catalytic action of germanium, resulting in highly conductive and patterned graphene. The graphene sensor exhibits excellent gas sensing properties due to the large charge transferred from graphene to NO2 molecules.
IEEE SENSORS JOURNAL
(2021)
Article
Environmental Sciences
Ting Zhao, Ruifeng Qian, Guanda Zhou, Yu Wang, Wan In Lee, Jia Hong Pan
Summary: The strategic integration of membrane water filtration with semiconductor photocatalysis provides deep purification with self-cleaning capability. Mesoporous WO3/TiO2 spheres show superior photocatalytic activity and high flux, making them promising for concurrent membrane filtration and solar photocatalysis.
Article
Environmental Sciences
Hye Jin Kang, Dong Ii Won, Yeongsu Lim, Jeongho Kim, Wan In Lee
Summary: The study found that Pt deposition greatly enhances the photocatalytic activity of ATO/TiO2, while Au or Ag depositions have less significant effects. Spectroscopic analysis indicated that Pt is most effective in scavenging electrons from the ATO CB. Pt/ATO/TiO2 produced significantly more CO2 than other catalysts, suggesting that Pt deposition can suppress charge recombination pathways effectively.
Article
Chemistry, Physical
Mohd Zahid Ansari, Petr Janicek, Dip K. Nandi, Stanislav Slang, Marek Bouska, Hongjun Oh, Bonggeun Shong, Soo-Hyun Kim
Summary: In this study, high-quality stoichiometric SnS thin films were successfully prepared by atomic layer deposition (ALD) using a liquid divalent Sn precursor and H2S. The films exhibited different growth phases at different temperatures, with optoelectronic properties evaluated by spectroscopic ellipsometry (SE) analysis.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Ga Yeon Lee, Seungmin Yeo, Seong Ho Han, Bo Keun Park, Taeyong Eom, Jeong Hwan Kim, Soo-Hyun Kim, Hyungjun Kim, Seung Uk Son, Taek-Mo Chung
Summary: The paper discusses the synthesis of eight novel zirconium and hafnium complexes as potential precursors for metal oxides and atomic layer deposition of HfO2. Among them, HfCp(edpa)(3) (8) was developed as a novel precursor for the ALD process of growing HfO2.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Jin-Hyeok Lee, Romel Hidayat, Rahul Ramesh, Hyeonsu Roh, Dip K. Nandi, Won-Jun Lee, Soo-Hyun Kim
Summary: This article reports the preparation of tungsten metal and other tungsten-based thin films using ALD process with THMCT and TBH. It was found that thermal ALD could not deposit pure tungsten metal films, but formed amorphous tungsten oxycarbide. Post-annealing and introducing additional H-2 plasma pulse step significantly reduced resistivity, resulting in tungsten carbide as the predominant phase.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Sarnai Puntsagdorj, Agni Raj Koirala, Jargalsaikhan Gombovanjil, Nguyen Nguyen Khanh, Sang Do Sung, Wan In Lee, Kyung Byung Yoon
Summary: A facile stamping method was used to assemble ordered arrays of mesoporous WO3 micropillars, resulting in the preparation of a series of WO3 heterostructural bilayer photoanodes. The 2.5/7.5 photoanode displayed a higher photocurrent density compared to a plain WO3 sheet, due to increased charge carrier density and other beneficial factors.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Tatsuya Nakazawa, Donghyun Kim, Jaehyeok Kim, Yohei Kotsugi, Taehoon Cheon, Seung-Min Chung, Soo-Hyun Kim, Hyungjun Kim
Summary: This study prepared RuS2, suitable for near-infrared photodetectors, by atomic layer deposition. The properties of RuS2 were investigated, and the influence of metallic Ru surface morphology on the reaction was discussed. It was proven that RuS2 exhibits good photoelectric performance under near-infrared light.
Article
Nanoscience & Nanotechnology
Hyeon-Seo Choi, Yu-Na Kim, Seungyeon Hong, Bowen Yang, Jiajia Suo, Ji-Youn Seo, Seok Joon Kwon, Anders Hagfeldt, Hyo Jung Kim, Wan In Lee, Hui-Seon Kim
Summary: Surface passivation using a mixed salt has been shown to improve the performance and stability of perovskite solar cells. The length of the alkyl chain in the mixed salt can manipulate the crystal formation dynamics and enhance the (001) plane. The enhanced crystal orientation during surface recrystallization reduces trap density and suppresses charge recombination, leading to an increase in open-circuit voltage and fill factor.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
So-Yeon Ju, Wan In Lee, Hui-Seon Kim
Summary: This study introduces the strategy of strain control into perovskite solar cells, showing that applying compressive strain can improve the long-term photovoltaic performance. The compressive strain-induced perovskite film exhibits relatively constant absorbance spectra, while the film without strain control gradually decays and develops an Urbach tail. Furthermore, the device without strain control displays unreliable and overestimated fill factor and conversion efficiency after long-term storage, whereas the compressive strain-induced device shows a stable performance with a 16% increase in fill factor over 911 hours.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
You Jin Park, Young In Jeon, In Seok Yang, Hyunsue Choo, Woo Seok Suh, So-Yeon Ju, Hui-Seon Kim, Jia Hong Pan, Wan In Lee
Summary: Novel TiO2 nanorods with different lengths are synthesized under a basic environment and applied as the electron transporting layer for perovskite solar cells. The nanorods exhibit superior photovoltaic performance compared to conventional TiO2 nanoparticles. Specifically, TiO2 nanorods with a length of 110 nm show the highest efficiency and improved long-term stability. The advantages of nanorod structures in the device and the suppression of charge recombination are discussed.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Debananda Mohapatra, Yujin Shin, Mohd Zahid Ansari, Youn-Hye Kim, Ye Jin Park, Taehoon Cheon, Haekyoung Kim, Jung Woo Lee, Soo-Hyun Kim
Summary: The authors investigate the use of delaminated V-MXene coupled with ruthenium (Ru) through atomic layer deposition (ALD) for real-time temperature sensing applications. The delaminated V-MXene engineered ruthenium-ALD temperature sensor demonstrates a competitive sensing performance compared to V-MXene alone. The heterostructure formation and the role of Ru have been comprehensively investigated by advanced microscopy techniques. This work could potentially motivate the development of multifunctional personal healthcare electronic devices by the industrially scalable ALD technique.
Article
Chemistry, Physical
Yu-Na Kim, Ju-Hee Jo, Jeongho Kim, Hui-Seon Kim, Wan In Lee
Summary: Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is commonly used as a dopant in 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluor-ene (spiro-MeOTAD), but it results in poor thermal stability. Recently, zinc(II) bis(trifluoromethanesulfonyl)imide (Zn(TFSI)2) has been proposed as a potential replacement for LiTFSI. This study explores the use of Zn(TFSI)2 as a dopant for spiro-MeOTAD to investigate the thermal stability of perovskite solar cells (PSCs).
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Debananda Mohapatra, Jeong Eun Byun, Mohd Zahid Ansari, Haekyoung Kim, Taehoon Cheon, Jongmoon Jang, Young-Rae Cho, Jung Woo Lee, Soo-Hyun Kim
Summary: By introducing layer-engineered delaminated Ti-MXene, the sensitivity and flexibility requirements of pressure sensors can be improved. The DL-Ti(3)C(2)Tx MXene-based pressure sensor, which is economical and scalable, demonstrates high pressure and fast response, and has a wider range of applications.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Review
Chemistry, Multidisciplinary
Mohd Zahid Ansari, Iftikhar Hussain, Debananda Mohapatra, Sajid Ali Ansari, Reza Rahighi, Dip K. Nandi, Wooseok Song, Soo-Hyun Kim
Summary: This paper offers a thorough review of atomic layer deposition (ALD) and its applications in supercapacitor electrode development. It scrutinizes the impact of ALD parameters on electrochemical performance, explores its utility in creating 3D nanoarchitectures, and examines the correlation between synthesis techniques and supercapacitor properties.
Article
Nanoscience & Nanotechnology
Sarnai Puntsagdorj, Agni Raj Koirala, Jargalsaikhan Gombovanjil, Nguyen Nguyen Khanh, Sang Do Sung, Wan In Lee, Kyung Byung Yoon
Summary: A facile stamping method was developed to assemble ordered arrays of mesoporous WO(3 )micropillars, and heterostructural bilayer photoanodes with different layer structures were successfully prepared. Among them, the 2.5/7.5 exhibited a higher photocurrent density, which can be attributed to multiple factors.
ACS APPLIED MATERIALS & INTERFACES
(2022)