Article
Chemistry, Multidisciplinary
Shaoyu Liu, Weiye Yang, Lei Liu, Huohuo Chen, Yingkai Liu
Summary: Ni-doped ZnO nanowire arrays with different Ni concentrations are grown on etched fluorine-doped tin oxide electrodes by hydrothermal method. The morphology and microstructure of the nanowire arrays are investigated and the sensitive property is measured. The Ni-ZnO nanowires with 8 at.% Ni precursor concentration show high selectivity for H2S and a large response compared to other gases.
Article
Materials Science, Multidisciplinary
Nengchang Xu, Zhaolin Yuan, Fengjun Nie, Jianfeng He, Xueyuan Wang, Shengyu You
Summary: In this study, gallium-doped zinc oxide nanowire arrays with different gallium doping concentrations were grown on glass substrates using a hydrothermal technique. The crystalline structure, morphology, and ultraviolet sensing performance of the samples were investigated. The results showed that well-aligned nanowire arrays could be achieved with gallium doping concentrations below 4%. Additionally, ultraviolet photodetectors prepared using the nanowire arrays exhibited excellent responses to 365 nm light.
Article
Engineering, Electrical & Electronic
Yunjing Zhu, Yunlei Ma, Dandan Wu, Guojian Jiang
Summary: In this study, ZnO/Ti3C2Tx composites with different proportions of Ti3C2Tx were synthesized using the hydro-thermal method. The effects of MXene content on the gas sensing properties of the composites were investigated, and it was found that the few-layer MXene solution exhibited better dispersion and gas sensing properties for ZnO.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Physical
Haili Huang, Zhentao Du, Hung-Chun Wu, Fengmei Gao, Lan Jiang, Huilin Hou, Shanliang Chen, Weijun Li, Feng Hu, Weiyou Yang, Dongdong Zhang, Lin Wang
Summary: In this study, a high-temperature resistant ethanol sensor based on rationally designed heterojunctions is constructed, exhibiting significantly improved performance in sensing ethanol at 465 degrees C. The sensor demonstrates high response, fast detection, and excellent selectivity, suggesting promising applications for stable sensors operating under harsh working conditions.
APPLIED SURFACE SCIENCE
(2024)
Article
Engineering, Electrical & Electronic
V. L. Patil, D. S. Dalavi, S. B. Dhavale, N. L. Tarwal, S. A. Vanalakar, A. S. Kalekar, J. H. Kim, P. S. Patil
Summary: This report focuses on the deposition of nanocrystalline aluminium doped ZnO (Al doped ZnO: AZO) samples on seeded glass substrates using a cost-effective reflux method. The doping concentration of 'Al' ions ranged from 1 to 3 vol%. The study found that the deposited AZO samples exhibited a wurtzite hexagonal crystal structure and the formation of nanorods for undoped ZnO, with a reduction in diameter and the formation of fine tips for AZO samples. The photoluminescence study confirmed the presence of oxygen vacancies and defects in the AZO samples. Furthermore, the AZO samples demonstrated excellent gas sensing performance towards NO2 gas at a temperature of 175 degrees C, with a gas sensitivity of 85% for 5 ppm NO2 gas. This work shows promise for practical applications in the gas sensor technology field, particularly for low detection limits at low operating temperatures.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Physical
Sonalika Agarwal, Mohammad Jamir Ahemad, Sanjay Kumar, Dao Van Dung, Prabhakar Rai, Manoj Kumar, Kamlendra Awasthi, Yeon-Tae Yu
Summary: PdO/ZnO flower-like nanostructures decorated with PdO nanoparticles were synthesized and studied for hydrogen sensing applications. The sensor showed high sensitivity, rapid response time, and selectivity towards hydrogen gas compared to other target gases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Neha Sakhuja, Ravindra Kumar Jha, Ranajit Sai, Navakanta Bhat
Summary: This article details a scalable and CMOS-compatible fabrication method for a chemiresistive sensor that can selectively detect hydrogen sulfide (H2S) gas. The sensor is based on a transition-metal dichalcogenide-oxide heterostructure and utilizes WS2 nanosheets as the seed material for the nano heterostructures. By growing ZnO nanorods on the WS2 nanosheets and forming a thin layer of metal sulfate and/or metal oxide on the surface, the sensor achieves high selectivity to H2S with a fast response and recovery time, as well as long-term stability.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Mehdi Akbari-Saatlu, Marcin Procek, Claes Mattsson, Goran Thungstrom, Tobias Torndahl, Ben Li, Jiale Su, Wenjuan Xiong, Henry H. Radamson
Summary: Designing heterostructure materials at the nanoscale is a well-known method to enhance gas sensing performance. In this study, ZnO/SnO2 heterostructures were grown on alumina substrates using the ultrasonic spray pyrolysis method. The results showed that the sensitivity of the sensor to H2S gas can be altered by changing the zinc chloride content in the precursor, and the heterostructures with a 5:1 ratio of ZnCl2 to SnCl2·2H(2)O exhibited the highest response. The gas sensing mechanism of the ZnO/SnO2 heterostructures was analyzed and attributed to the formation of the heterostructure between ZnO and SnO2.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Huiqin Zhou, Anlin Feng, Shanshan Ji, Yidong Hu, Qingyang Li
Summary: A ZnO nanowire array was synthesized within 10 minutes for the first time through electrodeposition of a Zn nanocrystal coating followed by a microwave hydrothermal treatment, offering the cheapest and fastest route from aqueous solutions so far. This simple, economical, efficient, flexible, and scalable method has promising prospects for industrial applications.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yusuf Selim Ocak, Meryem Lamri Zeggar, Mustafa Fatih Genisel, Nilufer Uslu Uzun, Mohammed Salah Aida
Summary: Metal oxide nanostructures with high surface-to-volume ratios are ideal for gas sensor fabrication. By depositing ZnO thin films on vertically aligned silicon nanowires with varying etching times, sensitivity and specific reactive surface of CO2 sensors can be improved. The sensors show low response and recovery times compared to those reported in literature.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Engineering, Electrical & Electronic
Onur Alev, Imren Erguen, Okan Oezdemir, Leyla Colakerol Arslan, Serkan Bueyuekkoese, Zafer Ziya Ozturk
Summary: Cu-doped ZnO nanorods showed enhanced sensor response towards ethanol and allowed operation at lower temperatures compared to pristine ZnO nanorods, with 2% and 3% Cu-doped sensors exhibiting selective behavior towards ethanol.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Daria I. Markina, Sergey S. Anoshkin, Mikhail A. Masharin, Soslan A. Khubezhov, Ivan Tzibizov, Dmitriy Dolgintsev, Ivan N. Terterov, Sergey V. Makarov, Anatoly P. Pushkarev
Summary: Detection of hazardous volatile organic and inorganic species, such as hydrogen halides (HX, X = Cl, Br, I), is crucial in ensuring human safety in the chemical industry. In this study, a cost-effective and highly sensitive detector was developed for optical detection of hydrogen chloride gas using solution-processed halide perovskite nanowire lasers. An anion exchange reaction between CsPbBr3 nanowires and vaporized HCl molecules led to the formation of a structure with a bromide core and a thin mixed-halide CsPb(Cl,Br)3 shell, which resulted in an increase in laser frequency. The optical response allowed for the detection of HCl molecules in the range of 5-500 ppm.
Article
Chemistry, Multidisciplinary
Subhavna Juneja, Jaspal Singh, Roshni Thapa, R. K. Soni, Jaydeep Bhattacharya
Summary: The text discusses the trend of sustainable development driving modern technology, emphasizing the importance of adopting greener fabrication processes in the manufacturing sector. A bi-functional hybrid system was synthesized using a biosynthetic reduction strategy, showing strong surface-enhanced Raman scattering characteristics.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Xin Li, Nan Zhang, Caixia Liu, Samira Adimi, Jingran Zhou, Dali Liu, Shengping Ruan
Summary: The ZnO/Zn2SnO4 nanocomposites synthesized via one-step hydrothermal method demonstrated excellent gas sensing properties towards formaldehyde, showing higher sensitivity, better selectivity, and lower detection limit compared with pristine Zn2SnO4 and ZnO.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Ahmad Ajjaq, Ozlem Barin, Ali Orkun Cagirtekin, Baktiyar Soltabayev, Selim Acar
Summary: ZnO and CuO nanostructured oxide ceramics were synthesized on ZnO-seeded micro-glass substrates, and their surface and gas-sensing characteristics were explored. The experiments showed that the two materials had different crystallinity and morphology, and ZOZO had better advantages for NH3 detection compared to ZOCO. The gas sensing performance of ZOZO and ZOCO also varied with temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sushil Kumar, Sk Riyajuddin, Kulvinder Singh, Lalit Yadav, Takahiro Maruyama, Kaushik Ghosh
Summary: In this study, a high-performance supercapacitor was successfully fabricated by increasing the carbon content of mesoporous graphitic carbon nitride, leading to enhanced conductivity and specific surface area. The device showed excellent cycle life and electrocatalytic performance, making it a promising hybrid material for energy storage and renewable energy applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Zubair Ahmed, Krishankant, Ritu Rai, Rajinder Kumar, Takahiro Maruyama, Chandan Bera, Vivek Bagchi
Summary: A method involving oxygen plasma exfoliation of layered double hydroxide (LDH) sheets was introduced to enhance the electronic conductivity and catalytic performance of NiFe-LDH, making it more efficient for the oxygen evolution reaction (OER). The catalyst NiFe-OOHOV exhibited superior OER activity with a low overpotential and high current density, along with excellent long-term stability and high faradaic efficiency for O-2 production.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Sk Riyajuddin, Mansi Pahuja, Parrydeep Kaur Sachdeva, Kashif Azmi, Sushil Kumar, Mohd Afshan, Firdaus Ali, Jenifar Sultana, Takahiro Maruyama, Chandan Bera, Kaushik Ghosh
Summary: Water splitting using renewable energy resources is an economic and green approach for producing high-purity hydrogen fuel. This study reports a superhydrophilic layered leaflike Sn4P3 on a graphene-carbon nanotube matrix as an efficient and stable electrocatalyst for water splitting. The catalyst exhibits outstanding electrochemical performance, stability, and solar-to-hydrogen conversion efficiency.
Article
Crystallography
Daiki Yamamoto, Shusaku Karasawa, Kamal Prasad Sharma, Takahiro Saida, Shigeya Naritsuka, Takahiro Maruyama
Summary: This study investigates the growth of single-walled carbon nanotubes (SWCNTs) using an Ir-catalyzed gas-source-type cold-wall chemical vapor deposition (CVD) method. The results show that the ethanol pressure and growth temperature have significant effects on the yield and morphology of SWCNTs. The optimized ethanol pressure allows for growth of SWCNTs at temperatures between 500°C and 800°C, with vertically aligned SWCNTs obtained at 700°C and 800°C. The estimated activation energy for SWCNT growth using an Ir catalyst is found to be smaller than that with a Co catalyst.
CRYSTAL RESEARCH AND TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Ashish Gaur, Vikas Pundir, Krishankant, Ritu Rai, Baljeet Kaur, Takahiro Maruyama, Chandan Bera, Vivek Bagchi
Summary: The research presented interfacially interacted and uniformly decorated Co3O4-NiO hybrid nanostructures formed by a metal-organic framework, demonstrating potential catalytic activity for the oxygen evolution reaction with a low overpotential and high stability.
DALTON TRANSACTIONS
(2022)
Article
Energy & Fuels
Takahiro Saida, Kan Sakakibara, Ryohei Igami, Takahiro Maruyama
Summary: This study investigates the use of carbon spheres as a catalyst support in polymer electrolyte fuel cells. The carbon spheres promote diffusion and improve platinum utilization by supporting highly dispersed platinum nanoparticles. The study finds that the platinum utilization rate and oxygen reduction reaction activity are enhanced with the use of carbon spheres as the catalyst support.
Article
Physics, Applied
Shu Kondo, Daiki Yamamoto, Kamal Prasad Sharma, Yazid Yaakob, Takahiro Saida, Shigeya Naritsuka, Masaki Tanemura, Takahiro Maruyama
Summary: In this study, SWCNTs were successfully grown on flexible stainless-steel foils with diameters distributed below 1.1 nm. By using an Ir catalyst with an alumina buffer layer of 90 nm thickness, vertically aligned SWCNTs with a thickness of 4.6 µm were achieved. This method proves to be more cost effective and easier to scale up for mass production of small-diameter SWCNTs compared to conventional CVD growth on Si wafers.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Mansi Pahuja, Sk Riyajuddin, Mohd Afshan, Shumile Ahmed Siddiqui, Jenifar Sultana, Takahiro Maruyama, Kaushik Ghosh
Summary: This study reports the development of a low-cost electrocatalyst with excellent durability and electrocatalytic performance for industrial-grade applications. It also demonstrates the ability to convert waste heat into green fuel.
ACS APPLIED NANO MATERIALS
(2022)
Article
Physics, Applied
Tatsuya Kashio, Asato Nakashima, Tomoaki Murahashi, Ryosuke Achiwa, Takahiro Maruyama, Shigeya Naritsuka
Summary: Nanodiamond is used to directly precipitate graphene at the interface between Ni catalyst and Si substrate, achieving a lower critical temperature and higher quality without the use of a capping layer.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Shusaku Karasawa, Kamal Prasad Sharma, Daiki Yamamoto, Takahiro Saida, Shigeya Naritsuka, Takahiro Maruyama
Summary: In this study, in situ X-ray absorption fine structure spectroscopy was used to analyze the behavior of cobalt catalysts during the growth of single-walled carbon nanotubes by alcohol catalytic chemical vapor deposition. The results showed that cobalt catalysts prepared from cobalt acetates consisted of both oxides and carbides, which were reduced at temperatures up to 800℃. Upon addition of ethanol, the cobalt catalysts gradually transformed into carbides. This indicates that cobalt catalysts are mainly composed of carbides formed during SWCNT growth under conventional growth conditions.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Environmental Sciences
De Indranil, Mansi Pahuja, Henna Mohi ud din Wani, Akashdeep Dey, Taru Dube, Rishita Ghosh, Nimisha Kankan, Jibanananda Mishra, Jiban Jyoti Panda, Takahiro Maruyama, Kaushik Ghosh, Manish Singh
Summary: This study assessed the in-vitro toxicity of the azodye Eriochrome Black T (EBT) and explored an innovative approach for dye remediation using nano-photocatalytic catalysts. The results showed the toxicity of EBT and established the mechanism by which it induces cellular toxicity. The study also demonstrated the potential of a novel catalyst for dye degradation with reduced toxicity compared to the parent compound.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Crystallography
Asato Nakashima, Tomoaki Murahashi, Ryosuke Achiwa, Tatsuya Kashio, Takahiro Maruyama, Shigeya Naritsuka
Summary: In this study, graphene was precipitated using crystallized Ni catalyst. The thermal crystallization process was enhanced by depositing an amorphous Ni layer to suppress the dewetting of the Ni catalyst. The resulted graphene was smooth and defect-free, and the crystallized Ni catalyst was found to effectively reduce the formation of defective graphene.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Chemistry, Physical
Shusaku Karasawa, Kamal Prasad Sharma, Takahiro Saida, Shigeya Naritsuka, Yuichi Haruyama, Toru Asaka, Takahiro Maruyama
Summary: In situ XAFS analysis revealed that the chemical states of catalyst particles during SWCNT growth are closely related to the metal properties.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Kar Fei Chan, Mohd Hafiz Mohd Zaid, Md Shuhazlly Mamat, Masaki Tanemura, Shahira Liza, Hidetoshi Miyazaki, Takahiro Maruyama, Katsuya Sako, Kamal Prasad Sharma, Nurul Huda Osman, Nor Kamilah Saat, Hazeem Ikhwan Mazlan, Yazid Yaakob
Summary: Carbon nanotubes (CNTs) can greatly enhance the thermal properties of ceramic matrix composites. By introducing CNTs into zinc silicate (ZS), the thermal transport parameters of the ceramic can be improved. However, at a CNTs mass fraction of 3.0 wt%, the surface hardness and thermal diffusivity of the composite decreased by 90.3% and 72.1% respectively, while the AC conductivity increased by 10^5 times.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Physics, Applied
Shusaku Karasawa, Takahiro Saida, Kamal Prasad Sharma, Shigeya Naritsuka, Takahiro Maruyama
Summary: In situ X-ray absorption fine structure (XAFS) analysis was conducted on Ni catalysts during the growth of single-walled carbon nanotubes (SWCNTs) via alcohol catalytic chemical vapor deposition (ACCVD). The Ni catalysts gradually underwent reduction and became metallic at the growth temperature (800 degrees C). When ethanol was added during SWCNT growth, the Ni catalysts underwent slight carbonization, similar to what was observed with Ir catalysts in a previous study. These findings demonstrate the growth of SWCNTs from nearly metallic catalysts using Ni catalysts under conventional ACCVD growth conditions. The results obtained from in situ XAFS analysis were consistent with atomistic computer simulations.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)