Article
Chemistry, Multidisciplinary
Hongxu Chen, Xing Li, Yu Wang, Yan Li, Yingfeng Yu, Haidong Li, Baoqing Shentu
Summary: Colloidal lithography was used to design and construct a high-performance plasmonic sensor based on Ag nanocone arrays embedded with Ag NPs. By carefully tuning the nanocone sizes, the reflectance troughs were considerably enhanced, leading to improved line shape and sensitivity of the sensor. Experimental findings confirmed the feasibility of this sensor.
Article
Multidisciplinary Sciences
Supachai Sompech, Pongsak Jittabut, Sukhontip Thaomola, Sasiporn Audtarat, Panadda Charee, Thananchai Dasri
Summary: The study shows that core-shell structured Ag@TiO2 nanoparticles can enhance the optical absorption activity of TiO2 in the visible spectrum, providing fundamental knowledge for future environmental and biomedical applications.
Article
Engineering, Electrical & Electronic
Biao Wu, Hailiang Chen, Qiang Chen, Zhiyong Yin, Chengjun Wang
Summary: This paper proposes a D-type highly sensitive surface plasmon resonance (SPR) sensor based on multilayer films coated with photonic crystal fiber (PCF). Silver is chosen as the plasmon material due to its sharper SPR spectrum compared to gold. Additionally, titania (TiO2) is used as the second layer film to prevent silver oxidation and enhance the SPR effect. The refractive index sensing performances are simulated using the finite element method (FEM). The optimized multilayer film structure shows a significant improvement in the wavelength sensitivity of the sensor, with a maximum sensitivity of 11,000 nm/RIU, an increase of 139% compared to a single silver film. The high sensitivity and figure of merit (FOM) of this sensor make it suitable for accurately detecting medical treatments and organic chemicals.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Virendrakumar G. Deonikar, John Marc C. Puguan, Hern Kim
Summary: This study investigates the Physico-chemical and Localized Surface Plasmon Resonance (LSPR) effects of Ag nanoparticles on WO3 center dot 0.33H(2)O thin films, leading to enhanced electrochromic performance. The hexagonal-snowflakes like WO3 center dot 0.33H(2)O/Ag(x%) nanohybrids showed significant improvement in optical modulation and coloration-bleaching time compared to pure WO3 center dot 0.33H(2)O films, thanks to improved electrical conductivity and intercalation-deintercalation pathways facilitated by Ag nanoparticles. Overall, the enhancement in electrochromic activity is attributed to the LSPR effect and tuned physical, chemical, and structural properties of the nanohybrids.
Article
Engineering, Electrical & Electronic
Ting Li, Wenlin Feng
Summary: The RFSPR sensor utilizing a PVA/TiO2 composite film was able to detect cadmium ions in water, with a detection range of 0-1 µM. The sensor demonstrated high sensitivity, excellent selectivity, and good stability, making it a potential tool for Cd2+ detection in aqueous solutions.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Yali Deng, Mei Li, Wen Cao, Ming Wang, Hui Hao, Wei Xia, Fu Su
Summary: In this study, a fiber optic Surface Plasmon Resonance (SPR) sensor based on Ag/TiO2 at 1550 nm wavelength for hydrogen sensing was proposed and demonstrated. The sensor design and experimental results show a high sensitivity to hydrogen concentration.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Pejman Hajipour, Abbas Bahrami, Maryam Yazdan Mehr, Willem Dirk van Driel, Kouchi Zhang
Summary: This study investigated the photocatalytic characteristics of Ag nanowire/TiO2 and Ag nanowire/TiO2/graphene oxide nanocomposites. Through direct coating of TiO2 particles on silver nanowires, successful deposition of TiO2 nanoparticles on the surface of Ag nanowires was confirmed. The synthesized Ag nanowire/TiO2/graphene oxide nanocomposite exhibited superior photocatalytic activities in decomposing Rhodamine B.
Article
Materials Science, Multidisciplinary
Sahar Mahnae, M. Saeed Hadavi, Hamid Reza Azizi
Summary: The research found that the surface roughness of pure TiO2 films decreased and the water contact angle increased with increasing substrate temperature and silver thickness. Additionally, the hydrophilicity of Ag-TiO2 layers increased with UV radiation time, while optical absorption increased with silver doping.
Article
Chemistry, Multidisciplinary
Sayako Maeda, Noboru Osaka, Rei Niguma, Tetsuya Matsuyama, Kenji Wada, Koichi Okamoto
Summary: In this study, the localized surface plasmon resonance (LSPR) in the visible range was demonstrated by using nanostructures on mirrors. The NHoM structure, based on random nanoparticles obtained by heat-treating silver thin films, showed tunability over a wide wavelength range and achieved full coverage of the sRGB color space. Comparison with the periodic NDoG structure revealed that the NHoM structure had less variation in resonant wavelength, indicating high color quality. The NHoM structure was also successfully applied in colorimetric sensing, showing significant improvement in performance.
Article
Chemistry, Physical
Sulakshana Mondal, Durga Basak
Summary: This study investigates the photosensitivity of Ag-TiO2 composite films and finds that the combination of Ag nanoparticles on TiO2 films enables high broad band photosensitivity from UV to visible wavelength. The transfer of hot electrons from Ag nanoparticles to TiO2 enhances the overall photosensitivity. However, the thickness increase of Ag nanoparticles on TiO2 affects the photosensitivity negatively due to aggregation of the metal particles.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: This paper reports a significantly improved sensing response of a plasmonic sensor based on a nanopillar array separated from a thin film, operated using the Kretschmann configuration. The sensor shows high sensitivity and figure of merit for both localized and bulk sensing responses. It can be easily fabricated and has great potential for biosensing applications.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Jun Li, Mingjing Xu, Jiaxin Liu, Hao Li, Hongbin Song, Ai Zhou
Summary: We proposed a highly sensitive surface plasmon resonance temperature sensor by adjusting parameters and coating the surface to enhance temperature sensitivity. The simulation results showed that the sensor had a temperature sensitivity of -16.26 nm/°C at 20°C and a high DSD-FOM in the range of 20°C-70°C.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yanfen Wang, Haocheng Yang, Hai Yun, Juan Gao, Yin Liu, Miao Zhang, Gang He, Zhaoqi Sun
Summary: The plasmonic Ag@AgBr nanoparticles were successfully synthesized on a TiO2 nanorod array through a secondary hydrothermal method. The crystallization time of Ag@AgBr was found to significantly affect the crystallinity, size, and optical properties of the ternary arrays. With an increase in crystallization time, the crystalline behavior of Ag@AgBr improved, leading to larger nanoparticles and a redshift in the surface plasmon resonance bands. The Ag@AgBr/TNR arrays exhibited enhanced photocatalytic efficiency in the degradation of methyl orange due to the synergistic effect of improved solar light response and efficient charge transfer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Elham Montakhab, Fereshteh Rashchi, Saeed Sheibani
Summary: The study investigated the photocatalytic activity of modified TiO2 nanotubes (TNTs) for water purification. Three modification methods including Ag nanoparticles (NPs) decoration (TNT-Ag), electrochemical reduction of the TNTs (TNT-H), and a simultaneous combination of these two methods (TNT-Ag-H) were studied. It was found that the combined method resulted in finer Ag NPs with better distribution due to the preferred sites for Ag nucleation provided by the defects formed during electrochemical reduction. The modified TNTs in the TNT-Ag-H sample showed increased SPR and absorption in the visible light region, and exhibited higher photocatalytic performance compared to unmodified TNT samples.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Nur Afifah Ahmad Nazri, Nur Hidayah Azeman, Mohd Hafiz Abu Bakar, Nadhratun Naiim Mobarak, Tg Hasnan Tg Abd Aziz, Ahmad Rifqi Md Zain, Norhana Arsad, Yunhan Luo, Ahmad Ashrif A. Bakar
Summary: An optical sensor-based localized surface plasmon resonance (LSPR) sensor was demonstrated for sensitive and selective chlorophyll detection through the integration of amino-functionalized carbon quantum dots (NCQD) and triangle silver nanoparticles (AgNPs). The sensor showed high sensitivity and detection limits, with no interference from other ionic species.
Review
Chemistry, Multidisciplinary
Syed Shaheen Shah, Md. Abdul Aziz, Munetaka Oyama, Abdul-Rahman F. Al-Betar
Summary: This review article summarizes various strategies for detecting sulfide in different media and emphasizes essential parameters such as sensing strategies, working electrodes, detection media, pH, LOD, sensitivity, and linear detection range. Future research directions in this area are recommended.
Article
Electrochemistry
Fumikazu Sato, Sota Funo, Zhiwei Cai, Gang Chang, Yunbin He, Munetaka Oyama
Summary: Depositing Ag on Ni wire prior to modification with Pt can significantly increase the electrocatalytic currents for alcohol oxidation reactions, providing an effective approach to modifying Ni materials with Pt.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Abdul Aziz, Syed Shaheen Shah, Mohammad A. Jafar Mazumder, Munetaka Oyama, Abdul-Rahman Al-Betar
Summary: This article presents a comparative electrochemical analysis of various carbon materials and polymer/surfactant composite electrocatalysts for sulfide oxidation. Among the tested materials, CNF@PMTC showed the best performance for direct sulfide electrooxidation due to its lowest oxidation peak potential and high catalytic current response. Therefore, CNF@PMTC can be considered a benchmark carbon-based electrocatalyst for sulfide oxidation.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Sota Funo, Fumikazu Sato, Zhiwei Cai, Gang Chang, Yunbin He, Munetaka Oyama
Summary: Pt and Au were successfully codeposited on Ni wire using a simple treatment in aqueous solutions, resulting in PtAu/Ni electrodes with enhanced electrocatalytic current and distinct CV responses. A small amount of Pt was considered to be effectively modified or incorporated into the Ni wire, significantly affecting the electrochemical properties.
Article
Chemistry, Applied
Mingming Yin, Weijie Wang, Jie Wei, Xiaomei Chen, Quansheng Chen, Xi Chen, Munetaka Oyama
Summary: This study presents a novel dual-emissive fluoroimmunoassay for synchronous monitoring of okadaic acid (OA) and saxitoxin (STX) using multicolor fluorescent labels. The method successfully measured OA and STX contents in Alectryonella plicatula and showed good agreement with commercial ELISA kits.
Article
Materials Science, Multidisciplinary
Marjoni Imamora Ali Umar, Dahyunir Dahlan, Muhammad Nurdin, Munetaka Oyama, Akrajas Ali Umar
Summary: The study demonstrated that adding PVP surfactant under alkaline conditions can modify the crystal growth preference in the c-axis direction of zinc oxide nanostructures, resulting in a two-dimensional nanostructure. The dimensions of the nanosheets depend on the concentration of NaOH, making them suitable as active materials in optoelectronic devices.
Article
Nanoscience & Nanotechnology
K. Nouneh, Y. Khaaissa, A. Talbi, O. K. Taghzouti, A. Belahmar, K. El Mabrouk, M. Zekriti, A. El Mouakibi, M. Oyama
Summary: A modified seed-mediated growth approach was proposed to produce gold nanoparticles on ITO surface through HAuCl4 chemical reduction in water. The study focused on seeding and growth number cycle process in forming Au nanoparticles on ITO surface. Results indicate that the absorbance intensity lambda(max) is substantially dependent on the sizes, shape, and density of metal nanoparticles on ITO surface. Characterization was done using FE-SEM, UV-Vis spectroscopy, and electrochemical measurements.
INTERNATIONAL JOURNAL OF NANOSCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Kanokwan Charoenkitamorn, Weena Siangproh, Orawon Chailapakul, Munetaka Oyama, Sumonmarn Chaneam
Summary: This study reports the detection of para-hydroxybenzoic acid (PHBA) in cosmetics using anodized screen-printed graphene electrodes (SPGEs). The anodized SPGEs showed significantly improved sensitivity for PHBA detection compared to pristine SPGEs, and demonstrated high ability and feasibility for onsite detection in cosmetics.
Article
Chemistry, Applied
Zisen Wu, Jie Wei, Tianhui Jiao, Qingmin Chen, Munetaka Oyama, Quansheng Chen, Xiaomei Chen
Summary: In this paper, a fast, selective, and sensitive sensor for determining the peroxide value (PV) of edible oils is reported. The sensor has a unique structure and characteristics, allowing for room-temperature operation with high selectivity and low detection limit.
Article
Chemistry, Applied
Mengke Xia, Xue Yang, Tianhui Jiao, Munetaka Oyama, Quansheng Chen, Xiaomei Chen
Summary: In this study, a novel and credible electrochemiluminescence immunoassay (ECLIA) was developed for the ultrasensitive and highly selective detection of aflatoxin B-1 (AFB(1)). The combination of amino-functionalized 3D graphene hydrogel (NGH) and self-enhanced ECL of luminol-palladium-graphene oxide (lum-Pd-GO) served as the platform and marker, respectively. The developed ECLIA exhibited low detection limit and broad linear relationship, and was successfully applied for the analysis of AFB(1) contents in food samples.
Article
Nanoscience & Nanotechnology
Rui Ge, Xueqi Lin, Hanjie Dai, Jie Wei, Tianhui Jiao, Qingmin Chen, Munetaka Oyama, Quansheng Chen, Xiaomei Chen
Summary: The study demonstrates improvements in the near-infrared light-driven photoelectrochemical response through the synergism between reduced graphene oxide and MoS2. Based on these findings, a NIR-responsive immunosensing platform for the analysis of Escherichia coli O157:H7 is developed.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Xiaomei Chen, Mingming Yin, Rui Ge, Jie Wei, Tianhui Jiao, Qingmin Chen, Munetaka Oyama, Quansheng Chen
Summary: Sensitive, portable detection methods for foodborne pathogens are important for early warning and prevention of diseases. This study used AgBiS2 nanoflowers and Cu2O nanocubes to develop a novel photoelectrochemical immunosensor. By combining n-type AgBiS2 nanoflowers and p-type Cu2O nanocubes with monoclonal and polyclonal antibodies, a highly efficient photocurrent-switching system was formed on a paper-based electrode. The NIR PEC immunoassay exhibited a low detection limit and could be used for point-of-care testing of E. coli O157:H7.
ANALYTICAL CHEMISTRY
(2023)
Article
Agriculture, Multidisciplinary
Jinjin Wang, Silun Li, Jie Wei, Tianhui Jiao, Qingmin Chen, Munetaka Oyama, Quansheng Chen, Xiaomei Chen
Summary: To prevent contamination of cereals by mycotoxins, a sensitive and rapid method for mycotoxin detection is essential. In this study, a screening-capture-integrated electrochemiluminescence (ECL) aptasensor based on mesoporous silica films (MSFs) was developed for the ultrasensitive and highly selective detection of deoxynivalenol (DON) in wheat. The sensor combines size screening and specific capture to achieve quantitative detection of DON, providing a new approach for early detection of wheat mildew.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Chemistry, Analytical
Hanjie Dai, Mingming Yin, Shumin Zhang, Jie Wei, Tianhui Jiao, Qingmin Chen, Quansheng Chen, Xi Chen, Munetaka Oyama, Xiaomei Chen
Summary: In this study, a novel paper-based photoelectrochemical sensor was developed for rapid and sensitive detection of Staphylococcus aureus. By utilizing specific modifications, the capture of S. aureus with high specificity was achieved, and signal enhancement was achieved using nanoflower probes. The sensor demonstrated rapid and ultrasensitive detection capabilities.
Article
Chemistry, Applied
Xueqi Lin, Rui Ge, Jie Wei, Tianhui Jiao, Qingmin Chen, Munetaka Oyama, Quansheng Chen, Xiaomei Chen
Summary: This study developed a magnetic-encoded fluorescent nanosphere-based immunosensor for simultaneous detection of multiple mycotoxins in wheat. The sensor showed high accuracy, selectivity, and sensitivity.
