Correction
Chemistry, Physical
Xuan-Hung Pham, Eunil Hahm, Tae Han Kim, Hyung-Mo Kim, Sang Hun Lee, SangChul Lee, Homan Kang, Ho-Young Lee, Dae Hong Jeong, Hak Soo Choi, Bong-Hyun Jun
Summary: The author name and corresponding affiliation in the original version of this article were mistakenly labeled.
Article
Chemistry, Physical
Wenlong Liao, Kunpng Liu, Yangjie Chen, Jianping Hu, Ya Gan
Summary: The article reports a facile method to fabricate Au-Ag bimetallic nanoparticles decorated silicon nanowires as 3D SERS substrates, and investigates the effects of Au-Ag bimetallic nanoparticles size and composition ratios on SERS performance through experiments and theoretical simulations. The prepared 3D SERS substrate shows higher SERS enhancement factor and oxidation resistance ability, making it potentially suitable for ultrasensitive detection of trace analytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Li Dong, Bin Liu, Shinya Maenosono, Jianhui Yang
Summary: Au@Ag@SiO2 core-shell-shell nanoparticles were synthesized using a simple one-pot technique, with the size of the Au@Ag core and the thickness of the SiO2 shell controlled by adjusting precursor concentration. The multilayered nanoparticles exhibited the chemical stability of Au and high scattering efficiency of Ag due to the SiO2 outer shell. Additionally, the SiO2 shell benefited the metal-enhanced fluorescence for biomedical applications. The metal-enhanced fluorescence, surface-enhanced Raman scattering, and photocatalytic activities of various core-shell nanoparticles were compared and discussed.
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
Chemistry, Physical
Van-Tuan Hoang, Lemma Teshome Tufa, Jaebeom Lee, Mai Quan Doan, Nguyen Ha Anh, Van Tan Tran, Anh-Tuan Le
Summary: This study investigates the surface-enhanced Raman spectroscopy (SERS) performance of Ag@Fe3O4 core-shell nanoparticles with different sizes. The smallest nanoparticles with thin shell and high shell porosity exhibit significantly improved mass diffusion and SERS performance, making them ideal substrates for highly sensitive detection of organic pollutants. Quantitative SERS measurements using the Ag@Fe3O4 nanoparticles were successfully demonstrated with methylene blue (MB) as probe analytes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
E. Shiju, T. Abhijith, Narayana D. Rao, K. Chandrasekharan
Summary: Core-shell structures with tunable multifunctional properties have been studied for their nonlinear optical behavior, showing enhanced optical limiting activity and negative nonlinearity with increasing shell thickness.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Analytical
Hongying Li, Jiale Zhang, Lingling Jiang, Ruo Yuan, Xia Yang
Summary: The identification of enantiomers is crucial in chiral separations and medicinal chemistry. Surface-enhanced Raman spectroscopy (SERS) is used to distinguish enantiomers by exploiting the SERS difference between left and right-handed circularly polarized light or additional selectors. In this study, L/D-Au@Ag core shell nanobipyramids were synthesized utilizing L/D-cysteine as a chiral encoder. These nanobipyramids exhibited plasmon-induced circular dichroism signals and could be tuned by adjusting the amount of cysteine. They were further used as SERS substrates for effective discrimination of biologically relevant small molecules, showing potential for chiral drug identification.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Physical
Ying Wang, Yonglong Li, Zhao Zhang, Wei Xie
Summary: Plasmonic photocatalysis is a promising strategy for inducing chemical transformations under visible-light irradiation. However, efficient utilization of hot electrons on monometallic nanoparticles remains challenging. In this study, Au-core-Ag-shell bimetallic nanoparticles showed higher catalytic activity than pure Au and Ag nanoparticles for the reduction of 4-nitrothiophenol to 4,4'-dimercaptoazobenzene. The catalytic activity was dependent on the thickness of the Ag shell and could be explained by hot-electron-hole separation at the bimetallic interface. This work provides new opportunities for enhancing the efficient utilization of hot electrons in plasmonic photocatalysis reactions.
Article
Nanoscience & Nanotechnology
Lan Thi Dang, Huy Le Nguyen, Hai Van Pham, Mai Thi Tuyet Nguyen
Summary: In this report, Au@Ag core-shell nanorod structures were developed for contaminants sensing by SERS. The silver shell thickness and plasmon wavelength were tuned by changing coating time and silver precursor amount. These structures showed ultra-sensitive detection ability for Nile blue A dye and Fenobucarb pesticide sensing. The Au@Ag core-shell sample with minimal silver shell thickness exhibited the highest Raman enhancement factor due to optimal enhancement of the electromagnetic field of bimetallic structures. This report demonstrates the potential applicability of combining unique features of two plasmonic metals in SERS-based analysis.
Article
Chemistry, Analytical
Shuyun Bi, Rui Zhao, Yue Yuan, Xu Li, Di Shao
Summary: A new SERS method for detecting amprolium HCl was established on a gold core and silver shell substrate, producing sharp Raman signal enhancement. The method showed a good linear relationship and a LOD of 0.48 nmol L-1 after optimization.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Yuqiu Wang, Shuchang Liu, Yongjun Hu, Cuicui Fu, Weiqiang Chen
Summary: Researchers developed a highly sensitive and stable SERS-active substrate by encapsulating Au nanorods in a bilayer silver shell with Raman reporter molecules. The substrate exhibited high reproducibility and stability, and showed significantly improved SERS intensity and detection sensitivity compared to other substrates. It was able to detect the pesticide thiram at a very low concentration, making it a promising tool for ultrasensitive analyte detection.
Article
Chemistry, Analytical
Ding Wang, Yiru Zhao, Shen Zhang, Liping Bao, Huijun Li, Jingcheng Xu, Bin He, Xumin Hou
Summary: This study developed a rapid and accurate method for the detection of acute myocardial infarction using surface-enhanced Raman scattering (SERS) technique. By preparing 4-Mercaptobenzoic acid embedded Au@Ag core-shell nanospheres, the detection of cardiac troponin I (cTn I) was successfully achieved. The prepared SERS nanotags could complete the analysis procedure within 15 minutes, indicating a faster detection speed and higher accuracy.
Article
Chemistry, Analytical
Lihong Su, Huilan Hu, Yanli Tian, Conghui Jia, Lulu Wang, Han Zhang, Jianlong Wang, Daohong Zhang
Summary: A dual-model colorimetric/SERS lateral flow immunoassay based on a metallic core-shell Au/Au nanostar was constructed for ultrasensitive determination of clenbuterol. The method achieved visual detection of clenbuterol at 5 ng/mL and quantitative detection as low as 0.05 ng/mL, significantly lower than traditional AuNPs-based immunoassays.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yan Ke, Bin Chen, Mengen Hu, Ningning Zhou, Zhulin Huang, Guowen Meng
Summary: This study demonstrates the controlled plasmon-mediated oxidation of para-aminothiophenol (p-ATP) using Au@Ag core-shell nanostars with tunable tip plasmons as reactors. The results show that plasmon bands of metal nanostructures play an important role in the efficiency of plasmon-driven photocatalysis.
Article
Chemistry, Analytical
Wenlong Liao, Yangjie Chen, Lijuan Huang, Yong Wang, Youting Zhou, Quan Tang, Zhenming Chen, Kunping Liu
Summary: The capillary-based SERS sensor is fabricated for ultrasensitive and selective detection of Hg2+ in water, with a limit of detection as low as 0.03 nM. It offers the advantages of simple preparation, superior stability, and high selectivity, promising for rapid and on-site detection of Hg2+ in water combined with a portable Raman device.
Article
Nanoscience & Nanotechnology
G. Dhanu Krishna, V. P. Mahadevan Pillai, K. G. Gopchandran
PHOTONICS AND NANOSTRUCTURES-FUNDAMENTALS AND APPLICATIONS
(2020)
Article
Materials Science, Multidisciplinary
V. S. Kavitha, S. R. Chalana, R. Reshmi Krishnan, K. G. Gopchandran, V. P. Mahadevan Pillai
Article
Chemistry, Inorganic & Nuclear
Sajesh Sasidharan, G. Jyothi, S. Sameera, K. G. Gopchandran
JOURNAL OF SOLID STATE CHEMISTRY
(2020)
Article
Engineering, Electrical & Electronic
G. Dhanu Krishna, V. P. Mahadevan Pillai, K. G. Gopchandran
OPTICAL FIBER TECHNOLOGY
(2020)
Article
Spectroscopy
Sunil Thomas, Rani George, Naser Qamhieh, K. G. Gopchandran, Saleh T. Mahmoud, Alessia Quatela
Summary: This study synthesized a Sr1.0Ba2.0B6O12:O.5Sm(3+) phosphor using the solid-state reaction method, and explored its spectroscopic properties including morphology, elemental composition, phase changes, crystallite phases, molecular vibrations, energy bandgap, bonding nature, and radiative properties. The phosphor emits cool-white light with high spectroscopic quality factor, stimulated-emission cross-section, quantum efficiency, and white-light emission, making it useful for display and lighting applications.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Analytical
C. R. Rekha, S. G. Jiji, V. U. Nayar, K. G. Gopchandran
Summary: Hexagonal hollow Au-Ag nanostructures were synthesized using galvanic replacement mechanism with silver nanoparticles as sacrificial templates. The cavity dimension in the hollow structures was found to be dependent on the amount of HAuCl4 used, and the optimal Ag: Au ratio was determined. The SERS activity of these hollow nanostructures was investigated using PCA, revealing them as reliable substrates for multiplexed SERS detection.
VIBRATIONAL SPECTROSCOPY
(2021)
Article
Optics
Sajesh Sasidharan, G. Jyothi, K. G. Gopchandran
Summary: Perovskite titanate nanophosphors, Ca1-x-yYxTiO3:yEu3+, have been successfully synthesized through solution combustion synthesis, achieving a tenfold increase in luminescence intensity and high color purity and long luminescence lifetime. X-ray Photoelectron Spectroscopy studies confirmed the 3+ oxidation state of yttrium and europium ions, as well as their occupancy at Ca2+ sites. The presence of Raman modes and TEM analysis also revealed the high crystallinity of the phosphors.
JOURNAL OF LUMINESCENCE
(2021)
Article
Engineering, Electrical & Electronic
P. Sajith Sethu, K. G. Gopchandran, Sam Solomon
Summary: The study proposes an optical system based on non-binary quasi-cyclic LDPC codes with a chi-square channel model to achieve large coding gains with smaller codeword lengths. Non-binary LDPC codes offer better error performance compared to their binary versions, while the quasi-cyclic property helps reduce encoding complexity.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Inorganic & Nuclear
Ramachandrapanicker Devi Chandra, Lalan Veena, Kunnel Gopalan Gopchandran
Summary: Cobalt (Co)-doped ZnO nanoparticles were synthesized at 100°C using a simple chemical technique, resulting in nanoparticles with high crystallinity and reduced defect density. Co-doping suppressed oxygen-vacancy-related defects at lower doping densities, but increased defect density at higher doping densities. Co-doping was found to significantly suppress defects in ZnO for electronic and optoelectronic applications, as demonstrated by XPS, PL, electrical conductivity, and Mott-Schottky analysis. Photodetectors fabricated with Co-doped ZnO nanoparticles showed faster response time due to the reduced defect density.
INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Veena Lalan, V. P. Mahadevan Pillai, K. G. Gopchandran
Summary: The synthesis of a new ternary nanocomposite, Ag-CaTiO3@rGO, with high photocatalytic dye degradation efficiency is reported. The high degradation efficiency of this photocatalyst is attributed to the synergistic effect of plasmon-induced visible light-harvesting due to Ag and enhanced adsorption and electron-transport properties due to rGO.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Ramachandrapanicker Devi Chandra, Kunnel Gopalan Gopchandran
Summary: Wurtzite ZnO nanoparticles were synthesized via a one-step process at temperatures ranging from 30-100 degrees C, resulting in highly crystalline particles with low oxygen vacancies that cause green emission. Various analyses such as XRD, HRTEM, photoluminescence, and XPS confirmed the characteristics of the nanoparticles. Optical absorption spectroscopy was used to estimate the band gap, and photodetectors made from the nanoparticles exhibited a clear response to UV light, making them promising candidates for linear optical synaptic devices.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
G. Jyothi, K. G. Gopchandran
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2020)
Proceedings Paper
Materials Science, Multidisciplinary
Viji Vidyadharan, S. Sameera, K. G. Gopchandran
MATERIALS TODAY-PROCEEDINGS
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
G. Jyothi, K. G. Gopchandran
3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (ICONMAT 2019)
(2019)
Article
Chemistry, Physical
S. G. Jiji, K. G. Gopchandran
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2019)
