Article
Nanoscience & Nanotechnology
Boyong Zhang, Wei Zhai, Jianyuan Wang
Summary: This study proposes a self-powered wavelength-dependent dual-polarity photodetector based on sandwich-structured core-shell nanorod arrays. The polarity of the photocurrent can be switched from negative to positive by controlling the incident light wavelength. The photodetector also demonstrates color discrimination and imaging capabilities.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Maryam Bonyani, Seyed Mojtaba Zebarjad, Kamal Janghorban, Jin-Young Kim, Hyoun Woo Kim, Sang Sub Kim
Summary: In this study, a selective NO2 gas sensor was successfully fabricated using Au-decorated ZnO nanofibers as the sensing material. By optimizing the thickness of the Au layer and annealing process, the sensor achieved optimal response to the target gas. The results highlight the importance of an appropriate amount of Au, generation of Au-ZnO Schottky junctions, and the catalytic effect of Au NPs in enhancing the sensing response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Junkai Shao, Caixuan Sun, Hongyan Liu, Ping He, Qi Liu, Jiachen Sun, Jiafeng Li, Guofeng Pan, Xueli Yang
Summary: In this study, LaFeO3 core-shell spheres functionalized with different amounts of Au nanoparticles (NPs) were synthesized successfully. Various characterization methods were used to confirm the samples' morphology, microstructure, and surface properties. Gas sensing investigation showed that gas sensors based on 4 wt. % Au-LaFeO3 core-shell spheres exhibited significantly enhanced sensing properties towards n-butanol compared to pure LaFeO3. This enhancement can be attributed to the Schottky barrier between Au NPs and LaFeO3 and the adsorption of n-butanol on Au NPs.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Chen Chen, Xumei Zhou, Jing Han, Sanping Chen
Summary: This study successfully synthesized an Au@PtAg/TiO2-Ti3C2 Schottky junction photoelectrode, which improved the generation efficiency of photocurrent by capturing and storing photogenerated electrons. The sensitivity of the aptasensor was further enhanced through Mg2+-dependent DNAzyme cascade amplification.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Dan-Yang Zhou, Guang-Yu Pan, Mei-Ling Xu, Xiong He, Tao Li, Fu-Tian Liu, Feng-Hua Jiang, Kui Li
Summary: In this work, ZnO-nano ZnO@porous carbon composite photocatalysts were fabricated through in situ Ostwald ripening mechanism and facile pyrolysis process. The tight binding of ZnO-ZIF-8 core-shell structure with controlled carbon layer thickness was achieved using ZnO nanorods as sacrificial templates. The nano-ZnO encapsulated with porous carbon materials improved the specific surface area, adsorption capacity of dye molecule, and transportation of charge carriers, leading to enhanced photocatalytic activity. The piezoelectric effect produced by the internal polarized electric field of ZnO further enhanced the separation of photogenerated carriers, enhancing the activity of photocatalytic degradation.
Article
Materials Science, Multidisciplinary
Min Yang, Yan Gong, Genli Shen, Zhen Wang, Mi Liu, Qi Wang
Summary: By synthesizing and comparing the gas sensing properties of Au@ZnO, Au-Pd@ZnO, and Au-Pt@ZnO nanoparticles, it was found that the Pt/Pd decorated Au-ZnO hetero-interface has a positive influence on benzene sensing performance.
Article
Environmental Sciences
Pooja Rani, Rajender S. Varma, Karanpal Singh, Roberto Acevedo, Jagpreet Singh
Summary: A waste leaf extract can be used to generate cost-effective gold and gold-silver core-shell nanoparticles, which exhibit improved catalytic and antibacterial capabilities compared to single-metal nanoparticles. This method is effective in removing contaminants from water and countering antibiotic resistance, and it is cost-effective and sustainable.
Article
Nanoscience & Nanotechnology
T. Van Tran, M. J. Ahemad, D. -S. Kim, T. D. Le, V. Dao, Y. -T. Yu
Summary: Pd@Au@ZnO core-double shell nanoparticles (CDS-NPs) with an added Au shell layer between the Pd core and ZnO shell were fabricated to improve the response and selectivity to hydrogen gas. After calcination, the Pd core becomes a gradient composition Pd-Au alloy, resulting in higher response and selectivity.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Physical
Junhao Cai, Jianrui Cao, Heng Tao, Ruoping Li, Mingju Huang
Summary: A novel 3D core-shell nanostructure decorated with plasmonic Au nanoparticles was prepared for efficient photoelectrochemical water splitting, achieving a photoconversion efficiency and photocurrent density 4.80 and 4.33 times higher than ZnO nanosheets, respectively.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Gauravjyoti D. Kalita, Podma P. Sarmah, Golap Kalita, Pankaj Das
Summary: A facile ligand-assisted approach was used to synthesize bimetallic Au-Pd nanoparticles with a tunable core@shell structure. The Au-Pd materials exhibited superior performance in two important reactions, with the Pd-core-Au-shell structure showing higher activity compared to the Au-core-Pd-shell structure.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Physical
Duan Zhang, Xiaodie Yang, Yujian Shen, Longkun Yang, Oscar Leonardo Camargo Moreira
Summary: Gas sensing devices are important for safety production, environment protection, and human health. Two-dimensional layered materials have been widely used for gas sensor design, and sensitivity and selectivity are major concerns. This study shows that the sensitivity and selectivity of SnSe2 gas sensors can be manipulated by decorating them with Au nanoparticles. The findings deepen our understanding of SnSe2 gas sensing mechanisms and provide an effective strategy for designing high-performance and low-cost gas sensors.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Taisei Kimura, Hiroshi Yao
Summary: This study focuses on the magneto-optical properties of Au@CuS core-shell nanoparticles. The researchers find that the charge carriers inducing surface plasmon behavior and magneto-optical activity are different between CuS and Au. Thinner and nonuniform shell formation leads to a decrease in magneto-optical activity, while thicker and more uniform shell leads to an increase.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Thaina Beatto, Wyllerson Gomes, Augusto Etchegaray, Ruchi Gupta, Renata Mendes
Summary: This study presents a biosensor based on a core-shell nanostructure consisting of zinc oxide (ZnO) nanoparticles coated with gold (Au). The core-shell nanostructure serves as a support for the immobilization of tyrosinase on screen-printed carbon electrodes to measure dopamine. The results indicate that the biosensor has remarkable selectivity and accuracy for the detection of dopamine in real samples, with a relative error of 3.8%. Additionally, the biosensor has a limit of detection of 86 nmol L-1 and a dynamic range of 0.1 to 500 μmol L-1 for dopamine in real samples. Thus, the proposed miniaturized biosensor device shows promise for the monitoring of dopamine in real samples and could be used for disease diagnosis and prognosis.
Article
Chemistry, Multidisciplinary
Caikang Wang, Xian Jiang, Qicheng Liu, Jiaqian Ding, Juan Zhou, Yawen Tang, Gengtao Fu, Jong-Min Lee
Summary: This study presents the synthesis of one-dimensional Au@PtPd@Pt nanowires using a template-induced method, which exhibit exceptional electrocatalytic activity and long-term electrochemical stability for alkaline hydrogen evolution reaction (HER). The nanowires' unique structure, consisting of ultrathin 1D nanowires with a core-shell-satellite structure and trimetallic elemental compositions, contributes to their superior performance. Moreover, the integrated Au@PtPd@Pt//RuO2 electrolyzer achieves a lower operating potential, showing great potential for practical water electrolysis.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Sumaira Anjum, Khadija Nawaz, Bushra Ahmad, Christophe Hano, Bilal Haider Abbasi
Summary: This research focuses on the fabrication of bimetallic nanoparticles using plant extracts, specifically Manilkara zapota leaf extract. The study shows that the leaf extract is capable of bioreducing metal ions to produce core-shell Au-Ag and hybrid Au-ZnO and Ag-ZnO nanoparticles. The phytochemical profiling and spectroscopic analysis confirm the involvement of certain phytochemicals in the synthesis process. The synthesized bimetallic nanoparticles exhibit enhanced therapeutic efficacy compared to their monometallic components and show potential for various applications, including antibacterial, anticancer, and anti-aging treatments. Moreover, the biocompatibility of these nanoparticles towards brine shrimp larvae and human red blood cells suggests their environmental and biological safety.
Article
Engineering, Environmental
Vanish Kumar, Sanjit Manohar Majhi, Ki-Hyun Kim, Hyoun Woo Kim, Eilhann E. Kwon
Summary: The article reviews the potential of In2O3-based materials for sensing H2S gas, emphasizing their sensing performance and operational temperature conditions. It also discusses sensing mechanisms, synthesis procedures, and future prospects, while carefully evaluating the best option for In2O3-based sensing method based on their performance on a parallel basis.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Chemistry, Physical
Sanjit Manohar Majhi, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim, Tae Whan Kim
Summary: This paper presents a discussion on types of gas sensors and energy-saving strategies, focusing on self-heated gas sensors, MEMS-based gas sensors, and room temperature operated flexible/wearable sensors, as well as their applications in environmental monitoring.
Review
Chemistry, Analytical
Sanjit Manohar Majhi, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim
Summary: The study focuses on rGO-loaded metal oxide nanofiber gas sensors, in which different amounts of rGO are added to metal oxide precursors using an electrospinning method to enhance gas response through different sensing mechanisms.
Review
Chemistry, Analytical
Sachin Navale, Mehrdad Shahbaz, Sanjit Manohar Majhi, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim
Summary: This review extensively discusses various morphologies of CuxO, composites of CuxO with other materials, and the decoration/doping of noble metals on CuxO nanostructures for reliable detection of H2S gas.
The review emphasizes on the detection mechanism of CuxO-based gas sensors, presenting findings that are valuable as a reference.
Review
Chemistry, Multidisciplinary
Sanjit Manohar Majhi, Ashraf Ali, Prabhakar Rai, Yaser E. Greish, Ahmed Alzamly, Sandeep G. Surya, Naser Qamhieh, Saleh T. Mahmoud
Summary: In the past few decades, there has been a surge of interest in the development of gas sensing devices to detect environmentally toxic, hazardous, and volatile organic compounds, largely driven by technological advancements in the field. Metal-organic frameworks (MOFs) have attracted significant attention in various fields, including gas sensing, due to their high adsorption sites, porosity, tunable morphologies, structural diversities, and room temperature sensing capabilities.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Analytical
Ha Young Lee, Jae Hoon Bang, Sanjit Manohar Majhi, Ali Mirzaei, Ka Yoon Shin, Dong Jae Yu, Wansik Oum, Sukwoo Kang, Min Lyul Lee, Sang Sub Kim, Hyoun Woo Kim
Summary: Detection of acetone is important in various fields, and this study developed a novel Au@Co3O4 core-shell nanoparticle sensor with high sensitivity, excellent selectivity, and low detection limit, providing insights for the preparation of other metal-oxide core-shell sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
Sanjit Manohar Majhi, Ashraf Ali, Yaser E. Greish, Hesham F. El-Maghraby, Naser N. Qamhieh, Abdul Razack Hajamohideen, Saleh T. Mahmoud
Summary: Recently, two-dimensional MXenes have gained significant interest as gas-sensing materials due to their superior chemical and physical properties. In this study, accordion-like Ti3C2Tx MXene sensors were successfully synthesized and demonstrated excellent sensitivity and stability for acetone vapor detection at room temperature.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Review
Chemistry, Analytical
Sachin Navale, Ali Mirzaei, Sanjit Manohar Majhi, Hyoun Woo Kim, Sang Sub Kim
Summary: This review presents the cutting-edge research on chemiresistive gas sensors in Korea, specifically focusing on the research activities of Professors Sang Sub Kim and Hyoun Woo Kim. The review discusses advances in synthesis techniques and strategies to enhance gas-sensing performances of different nanomaterials. It also highlights important achievements, such as optimizing shell thickness in core-shell gas sensors and the design of selective and highly flexible gas sensors-based on WS2 nanosheets.
Review
Chemistry, Multidisciplinary
Sanjit Manohar Majhi, Ali Mirzaei, Sachin Navale, Hyoun Woo Kim, Sang Sub Kim
Summary: The focus of the research is on improving the performance of gas sensors, including high sensitivity, good selectivity, and durability. Utilizing various irradiation techniques for research can contribute to the development of highly reliable sensors for assessing environmental and health situations.
Review
Environmental Sciences
Ali Mirzaei, Vanish Kumar, Maryam Bonyani, Sanjit Manohar Majhi, Jae Hoon Bang, Jin-Young Kim, Hyoun Woo Kim, Sang Sub Kim, Ki-Hyun Kim
ASIAN JOURNAL OF ATMOSPHERIC ENVIRONMENT
(2020)
Article
Biochemical Research Methods
Nawab Singh, Azahar Ali, Prabhakar Rai, Inayathullah Ghori, Ashutosh Sharma, B. D. Malhotra, Renu John
Article
Materials Science, Biomaterials
Sandeep G. Surya, Sanjit M. Majhi, Dilip K. Agarwal, Abdellatif Ait Lahcen, Saravanan Yuvaraja, Karumbaiah N. Chappanda, Khaled N. Salama
JOURNAL OF MATERIALS CHEMISTRY B
(2020)
Article
Chemistry, Multidisciplinary
Sanjit Manohar Majhi, Hu-Jun Lee, Ha-Nui Choi, Ha-Young Cho, Jin-Soo Kim, Cheul-Ro Lee, Yeon-Tae Yu