Article
Chemistry, Analytical
Myung Sik Choi, Ali Mirzaei, Han Gil Na, Sangwoo Kim, Dong Eung Kim, Kyu Hyoung Lee, Changhyun Jin, Sun-Woo Choi
Summary: This study proposed a method to enhance the gas sensing properties of metal oxide nanowires by preparing Pd metal catalyst surrounded by SnO2-x with structural defects on the surface of SnO2 nanowires. Gas sensing studies demonstrated the promising effects of this approach, showing the usefulness of significantly enhancing the gas sensing properties.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Jae-Hun Kim, Ali Mirzaei, Isao Sakaguchi, Shunichi Hishita, Takeo Ohsawa, Taku T. Suzuki, Sang Sub Kim, Noriko Saito
Summary: In this study, bimetallic decoration technique was used to prepare a sensor material for acetone sensing. The optimized sensor exhibited good selectivity and fast dynamics towards acetone, even in a high-humidity environment. The enhanced sensing capability of the sensor was attributed to the effects of the implanted metal nanoparticles and the formation of surface defects and Schottky barriers.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Chemical
Wendi Tian, Huiju Zhang, Yan Zhang, Yan Wang, Jianliang Cao
Summary: In this research, a novel two-dimensional hexagonal boron nitride decorated nickel oxide heterojunction was synthesized successfully, and the decoration significantly enhanced the gas sensing property of nickel oxide towards triethylamine. The main contribution of such remarkable results lies in the unique embedding structure of nanoparticles, oxygen defects, and the formation of heterojunction.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Jae-Hun Kim, Ali Mirzaei, Minoru Osada, Hyoun Woo Kim, Sang Sub Kim
Summary: The study utilized pristine and Pd-decorated 2D ZnO nanosheets for hydrogen detection, showing positive effects of Pd decoration on response, sensing temperature, and selectivity. Gas sensing experiments demonstrated that the Pd-decorated nanosheet sensor successfully detected low concentrations of hydrogen gas and could also detect hydrogen in a gaseous mixture with benzene. Furthermore, the presence of Pd-ZnO heterojunctions, formation of PdHx, and high catalytic activity of Pd were found to contribute to the sensing enhancement of the Pd-decorated sensor.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Jae-Hun Kim, Ali Mirzaei, Sang Sub Kim, Changkyoo Park
Summary: In this study, a sensitive and selective toluene gas sensor based on SnO2 nanowires (NWs) was fabricated using FS laser irradiation and Pt nanoparticle (NPs) decoration. The FS laser irradiation-induced embossing surface was found to be dominant in determining the gas-sensing behavior, while Pt decoration on the FS laser-irradiated SnO2 NWs further enhanced the sensor response. The gas sensor showed high selectivity towards C7H8 and exhibited promising potential for reliable toluene gas sensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Engineering, Environmental
Md Shoriful Islam, Lakshya Mathur, Yeon Namgung, Bhupendra Singh, Jun -Young Park, Sun-Ju Song
Summary: Real-time monitoring and quantification of exhaust pollutants is crucial but difficult due to harsh conditions. In this study, BiVO4 nanoparticles are used to enhance the sensing performance in mixed-potential sensors. The results show that the nanoparticle decoration improves the microstructure and extends the triple phase boundary, resulting in higher sensitivity and faster response time. The fabricated sensor also exhibits good selectivity and stability.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Chandrabhan Patel, Sumit Chaudhary, Vikash Kumar Verma, Mayank Dubey, Sharath Sriram, Shaibal Mukherjee
Summary: In this study, pristine WO3 and Pd-loaded WO3 were synthesized using a simple hydrothermal method and integrated with an IoT-enabled portable resistance readout circuit for real-time sensing of H2S. Various characterizations were performed to investigate the crystal structure, surface morphology, active surface area, and elemental composition of the synthesized materials. The sensor showed improved sensing response towards H2S with the loading of 0.25 and 0.5 mol% Pd, but a reduction in response was observed with further loading of 1 mol% Pd.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Analytical
Jae Hoon Bang, Ali Mirzaei, Myung Sik Choi, Seungmin Han, Ha Young Lee, Sang Sub Kim, Hyoun Woo Kim
Summary: The study involved decorating multi-walled carbon nanotubes with Cu2O/CuO nanoparticles for gas sensing applications, resulting in high sensor response to H2S gas. The Cu2O/CuO decorations increased the effective surface area for sensing studies and acted as an effective catalyst for H2S gas.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Ceramics
Jae Hoon Bang, Ali Mirzaei, Seungmin Han, Ha Young Lee, Ka Yoon Shin, Sang Sub Kim, Hyoun Woo Kim
Summary: In this study, Pt-decorated Bi2O3-branched SnO2 nanowires gas sensor exhibited superior NO2 sensing performance compared to pristine and branched SnO2 gas sensors, and operated at near room temperature. The enhanced sensing capacity was attributed to the synergistic effects of Pt decoration and Bi2O3 branching.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Ahmad Kamalianfar
Summary: Root-like ZnO microstructures were synthesized using a chemical method with the deposition of Ag nanoparticles. The gas-sensing characteristics were investigated by varying the annealing time. Williamson-Hall analysis revealed that the crystallite size increased from 5.3 nm to 63.3 nm with increasing annealing time. The presence of nanowires on the roots improved conduction and intensified gas-adsorption phenomena, resulting in an excellent gas-sensing performance of the Ag/ZnO sensor towards ethanol.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ying Gao, Jinniu Zhang, Deying Leng, Gang Li, Yuanyi Zhang, Wei Wang, Qingfei Liang, Xiaorui Chen, Hongbing Lu, Jianzhi Gao
Summary: A series of porous Rh-NiO heterojunction nanofibers with different molar ratios were fabricated by a facile electrospinning technique to improve the sensing properties of p-type NiO. The sensor with an optimal Rh amount of 5 mol% showed the highest p-type response to acetone and excellent selectivity. The improved sensing response was attributed to the formation of ohmic contacts between Rh and NiO nanoparticles, chemical sensitization effect of Rh nanoparticles, and increased BET surface area.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Chu Manh Hung, Lai Van Duy, Dang Thi Thanh Le, Hugo Nguyen, Nguyen Van Duy, Nguyen Duc Hoa
Summary: By decorating Pd nanoparticles onto ZnO nanostructures, the optimal working temperature of the sensor can be significantly reduced, with improved response and recovery time to acetone, as well as increased sensitivity and detection limit. The Pd-ZnO sensor demonstrates effective reusability through multiple on/off switching cycles.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Chemistry, Analytical
Zhicheng Cai, Jiho Park, Sunghoon Park
Summary: Pd and Fe2O3 nanoparticles-embedded porous NiO nanofibers with high specific surface area were prepared using electrospinning. Adjusting the amount of Fe2O3 nanoparticles in the precursor solution regulated the morphological evolution and crystallization of oxide heterostructures, leading to enhanced gas sensing performance for hydrogen gas. The sensors exhibited excellent response towards 1000 ppm H-2 gas, with a response time of 11 seconds and good selectivity and stability.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Taehoon Kim, Tae Hyung Lee, Seo Yun Park, Tae Hoon Eom, Incheol Cho, Yeonhoo Kim, Changyeon Kim, Sol A. Lee, Min-Ju Choi, Jun Min Suh, In-Sung Hwang, Donghwa Lee, Inkyu Park, Ho Won Jang
Summary: Decorating noble metal nanoparticles on 2D semiconductor material MoS2 can enhance selectivity for chemical sensor arrays. We successfully decorated noble metal nanoparticles on MoS2 flakes without reducing agents. The selectivity of MoS2 flakes changed significantly after surface decoration, allowing clear distinction between ammonia, hydrogen, and ethanol gases. The role of noble metal decoration in selectivity change was investigated using density functional theory calculations, which revealed that the sensitivity to hydrogen correlated with binding energy, while the sensitivity to ammonia was related to deactivation of binding sites at the MoS2 edge due to metal nanoparticle decoration. This study provides fundamental understanding for designing efficient sensor arrays based on 2D materials.
Article
Chemistry, Physical
Zicheng Cai, Eunjung Goo, Sunghoon Park
Summary: Ethanol sensors with superior performance were fabricated using Au nanoparticles decorated SnO2 hollow nanospheres (Au-SnO2 HNS). The ethanol-sensing response of SnO2 HNS improved 2.7 times when exposed to 100 ppm ethanol gas measured at 250 degrees C, showing selective sensing response towards ethanol gas compared to other VOC gases. The improved sensing properties were attributed to the optimized morphologies of the sensing materials and the catalytic effect of the Au nanoparticles.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Jae-Hun Kim, Ali Mirzaei, Jin-Young Kim, Dong-Hoon Yang, Sang Sub Kim, Hyoun Woo Kim
Summary: In this study, 2D pristine and Au-decorated WS2-SnO2 core-shell nanosheets were successfully synthesized for highly sensitive CO gas sensing applications. The gas sensors showed very low applied voltage and high performance, with no significant degradation in sensing performance after 10,000 bending cycles, demonstrating great potential for commercial applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Jae-Hun Kim, Isao Sakaguchi, Shunich Hishita, Taku T. Suzuki, Noriko Saito
Summary: A new ternary structure was designed to enhance the sensing properties of WS2 nanosheet-based gas sensors at room temperature in self-heating mode. SnO2 nanowires were added to WS2 nanosheets and Au nanoparticles were deposited on the surface of the resulting composites. The presence of SnO2 nanowires effectively enhanced the diffusion and adsorption of gas species, while the chemical sensitization of Au contributed to an enhanced response to CO gas. The results showed the potential of the Au-decorated SnO2-WS2 as a low-power, low-voltage CO gas sensor in wet environments.
Review
Chemistry, Analytical
Ali Mirzaei, Hamid Reza Ansari, Mehrdad Shahbaz, Jin-Young Kim, Hyoun Woo Kim, Sang Sub Kim
Summary: This review focuses on the development and application prospects of resistive gas sensors based on metal oxide semiconductors (MOSs), and introduces the application of different morphologies of metal oxides in sensor fabrication.
Article
Engineering, Electrical & Electronic
Sang Sub Kim, Hyoun Woo Kim, Ali Mirzaei, Wansik Oum, Heon Ham, Yong Jung Kwon, Sareh Mosleh-Shirazi, Ka Yoon Shin, Dong Jae Yu, Suk Woo Kang, Eun Bi Kim
Summary: The direct synthesis of graphene nanosheets from fullerene clusters without the need for catalyst or substrate is achieved using a pulsed current sintering method. This approach offers promising opportunities for the preparation of various carbon nanomaterials.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Analytical
Hadi Riyahi Madvar, Zoheir Kordrostami, Ali Mirzaei
Summary: Sputtered-assisted CuO-decorated ZnO nanorod (NR) gas sensors were fabricated and optimized for ethanol gas sensing. The addition of CuO nanoparticles on the surface of ZnO nanorods improved the sensor's response to ethanol. Gas sensing studies revealed that a 5 nm Cu layer on ZnO NRs showed the highest response to ethanol at 350 degrees C. The optimized gas sensor demonstrated selectivity, repeatability, and long-term stability.
Article
Chemistry, Analytical
Jae-Hyoung Lee, Jin-Young Kim, Ali Mirzaei, Myung-Sung Nam, Hyoun Woo Kim, Sang Sub Kim
Summary: Ultraviolet (UV) irradiation can enhance the photocatalytic properties of metal oxide semiconductors, such as titanium dioxide (TiO2), leading to reduced power consumption of metal oxide gas sensors. In this study, nickel oxide (NiO) and polyaniline (PANI) were loaded into TiO2 nanoparticles (NPs) using the sol-gel method to investigate their acetone-sensing properties under UV illumination. The PANI/NiO co-loaded TiO2-NP composite gas sensor showed the highest performance under UV illumination at room temperature, with a selective response to acetone gas and a low limit of detection.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Jae-Hyoung Lee, Jin-Young Kim, Myung-Sung Nam, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim
Summary: Ternary hybrid composite of PANI-loaded Co3O4-TiO2 nanoparticles was synthesized and investigated for acetone sensing at 25°C. The 0.01 wt% PANI-loaded 0.85TiO2-0.15 Co3O4 composite nanoparticles showed the highest response to acetone under UV illumination. The improved performance was attributed to the formation of p-n heterojunctions, promising effects of PANI, and the UV light effect. This study highlights the potential of these compounds or related compounds for highly reliable acetone sensing at 25°C.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Hyoungwon Park, Jae-Hun Kim, Won-Sang Shin, Ali Mirzaei, Yoon-Jun Kim, Sang Sub Kim, Marcus Halik, Changkyoo Park
Summary: This study proposes an effective strategy to improve the selectivity and response of SnO2 nanowire-based gas sensors by adopting self-assembled monolayer functionalization and post-treatment femtosecond laser irradiation. The functionalization enhances gas selectivity by tuning surface chemical states, while the laser irradiation creates embossing surfaces and twin structures, improving gas adsorption and response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Physical
Hossein Roshan, Mohammad Hossein Sheikhi, Ali Mirzaei, Thanayut Kaewmaraya, Tanveer Hussain, Rosaria Brescia
Summary: In search of infrared photosensitive materials without heavy metals, silver sulfide nanocrystals were investigated and found to have broadband detection capabilities from visible to infrared (up to 2500 nm wavelength). The nanocrystals were synthesized at room temperature and integrated into a planar photodetector architecture. The proposed photodetector exhibited high-performance near-infrared detection ability up to 2500 nm wavelength, attributed to the presence of sulfur vacancies.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Analytical
Ali Mirzaei, Somalapura Prakasha Bharath, Jin-Young Kim, Krishna K. Pawar, Hyoun Woo Kim, Sang Sub Kim
Summary: Resistance gas sensors based on metal oxides are widely used, but their high operating temperature calls for alternative materials. Graphene and its derivatives have shown promise in gas sensing due to their 2D structure with high surface area and sensitivity to carrier concentration changes. N-doping of graphene can enhance gas-sensing features by inducing band gaps, generating defects, and improving conductivity. This article discusses the gas-sensing properties of N-doped graphene, covering both experimental and theoretical studies.
Article
Chemistry, Physical
Dong-Hoon Yang, Jae-Hun Kim, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim
Summary: In this study, WS2 nanosheets were co-decorated with In2O3 and Au nanoparticles to fabricate CO gas sensors, which were operated in self-heating mode at low temperature to reduce power consumption. It was found that the co-decorated gas sensor exhibited higher sensing performance and selectivity compared to bare WS2 nanosheets, due to the resistance modulation from In2O3-WS2 heterojunctions and the catalytic effect of Au nanoparticles on oxygen dissociation and CO adsorption.
APPLIED SURFACE SCIENCE
(2023)
Review
Chemistry, Physical
Ali Mirzaei, Myoung Hoon Lee, Krishna K. Pawar, Somalapura Prakasha Bharath, Tae-Un Kim, Jin-Young Kim, Sang Sub Kim, Hyoun Woo Kim
Summary: Metal oxide nanowires grown by the vapor-liquid-solid (VLS) mechanism are among the best candidates for resistive gas sensors. This review article discusses the gas-sensing features of these nanowires, focusing on growth conditions and sensing mechanism. The growth and sensing performance of various metal oxide materials with nanowire morphology are discussed, along with the effects of catalyst type, growth temperature, and other variables on the nanowires.
Article
Chemistry, Multidisciplinary
Trang Thi Thu Nguyen, Bao Quang Gia Le, Vy Tran Hanh Nguyen, Jae-Hyoung Lee, Ngoc Xuan Dat Mai, Linh Ho Thuy Nguyen, Tan Le Hoang Doan
Summary: This paper presents a microwave-irradiation-based technique for the synthesis of porous adenine-incorporated Zn-based MOFs with particle sizes of approximately 200 nm as paclitaxel nanocarriers. The nanomaterial demonstrated a substantial paclitaxel loading capacity and increased solubility compared to the free form, making it a promising delivery vehicle for paclitaxel. Additionally, the paclitaxel-loaded nano MOF exhibited higher toxicity toward cancer cells, highlighting its potential as an effective anticancer agent.
Article
Engineering, Electrical & Electronic
Hamid Reza Ansari, Zoheir Kordrostami, Ali Mirzaei
Summary: In this article, a handheld breath alcohol detection device based on CuO-decorated Fe2O3 nanoflakes (NFs) was developed. The device integrated a miniaturized platinum micro-heater and interdigitated electrodes (IDEs) on the sensor substrate. CuO nanoparticles (NPs) were decorated on Fe2O3 NFs, improving the sensing properties of the gas sensor. The optimal gas sensor showed a response of 10-100 ppm ethanol at 250 degrees C with a response time of 12 seconds and a recovery time of 57 seconds.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Chemistry, Physical
Clemence Badie, Jae-Hyoung Lee, Ali Mirzaei, Hyoun Woo Kim, Syreina Sayegh, Mikhael Bechelany, Lionel Santinacci, Sang Sub Kim
Summary: In this study, a new structure based on Pd-decorated TiN-coated SnO2 nanowires (NWs) was designed for selective detection of H-2 gas. SnO2 NWs were grown using a vapor-liquid-solid method, followed by the deposition of a TiN layer and Pd nanoparticles using atomic layer deposition (ALD). H-2 gas sensing studies showed that the sensor with a 1 nm-thick TiN layer exhibited the highest response, which was further improved by Pd decoration. The optimized sensor demonstrated excellent sensitivity for hydrogen gas, making it suitable for real application in H-2 monitoring with high selectivity.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
