Article
Chemistry, Multidisciplinary
Pengxing Sha, Qingqing Su, Peitao Dong, Tianran Wang, Chushu Zhu, Weiye Gao, Xuezhong Wu
Summary: The use of Ag@Au core-shell nano-rod (NR) array SERS substrate has been shown to successfully prepare a highly sensitive, repeatable, and stable substrate with great potential in the field of biochemical sensing.
Article
Chemistry, Physical
Yuenan Pan, Qi Chu, Shuang Guo, Sila Jin, Eungyeong Park, Yeonju Park, Yantao Sun, Lei Chen, Young Mee Jung
Summary: The purpose of this study is to investigate the charge transfer process and SERS enhancement mechanism in the Ag/MBA/PAN system with varying thicknesses of PAN. The results show that increasing the PAN thickness leads to higher frequency and intensity of the characteristic MBA band, as well as increased intensity of the b2 mode. The degree of CT also increases with increasing PAN thickness, due to the excited SPR from Ag. The electromagnetic enhancement mechanism at the PAN/Ag interface generates hot electrons and facilitates electron transfer in the CT process.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ajay P. Manuel, Saralyn Riddell, Harshitha Rajashekhar, Damini Vrushabendrakumar, Kazi M. Alam, Pawan Kumar, Sergey Gusarov, Alexander E. Kobryn, Mustafa Supur, Richard L. McCreery, Karthik Shankar
Summary: Core-shell Au@Pt nanoislands were fabricated on glass substrates using magnetron sputtering and thermal annealing. Addition of ultrathin Pt shells caused redshift and broadening of the localized surface plasmon resonance peak of Au. The coated Au@Pt nanoislands showed superior methylene blue degradation performance and hot carrier injection was validated by Raman thermometry studies.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Lei Chen, Yang Jin, Shuang Guo, Eungyeong Park, Yunfei Xie, Young Mee Jung
Summary: In this study, sea urchin-shaped NTO nanowires decorated with Ag nanoparticles were fabricated as a promising SERS substrate. The appropriate Ag decoration was found to enhance the SERS activity by increasing nanogaps and thus improving the electromagnetic field contribution. The optimized SERS substrate also showed improved photocatalytic hydrogen evolution activity.
Article
Chemistry, Analytical
Joshua Raveendran, Aristides Docoslis
Summary: A facile two-step method was used to form Ag core - Au shell nanostructures, which were then used as SERS substrates to detect and quantify toxicants. By combining a data reduction technique and a linear classifier, successful identification and quantification were demonstrated with a high success rate.
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: The study focuses on the plasmonic coupling between noble-metal and semiconductor nanostructures, and reveals the enhanced charge transfer and surface-enhanced Raman scattering (SERS) signals in a designed W18O49/Ag heterostructure. A new coupled-plasmon-induced charge transfer mechanism is proposed, providing insight for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Lin Zhu, Zhen Meng, Saizhen Hu, Tiancong Zhao, Bing Zhao
Summary: In this study, we for the first time observed and considered the plasmonic coupling between noble-metal and semiconductor nanostructures in metal/semiconductor heterostructures, using a W18O49/Ag heterostructure composed of Ag nanoparticles and W18O49 nanowires. The heterogeneous structure exhibited a broad and strong surface plasmon resonance (SPR) absorption in the visible wavelength range. Surface-enhanced Raman scattering (SERS) was used to investigate the interactions between metal SPR, semiconductor SPR, and the heterostructure's charge transfer process, revealing that the coupled SPR enhanced the heterostructure's internal charge transfer and SERS signals. A new coupled-plasmon-induced charge transfer mechanism was proposed to explain the improved charge transfer efficiency. This work provides insights for further studies on plasmonic effects and interfacial charge transfer in metal/semiconductor heterostructures.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Xinlu Zheng, Weiwei Zhang, Jinlong Zhang, Lingzhi Wang
Summary: The yolk-shell Fe3O4@void@CeO2 exhibited high SERS sensitivity with an enhanced factor of 1.1 x 10(4) using methylene blue as the analyte model. The enhanced light-scattering ability of the YS structure and improved molecule adsorption benefitting from the more exposed surface played vital roles in the high SERS activity. Additionally, the composite could be conveniently recycled through magnetic separation and light irradiation due to the photocatalytic degradation of MB molecules by CeO2.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Lam Bang Thanh Nguyen, Yong Xiang Leong, Charlynn Sher Lin Koh, Shi Xuan Leong, Siew Kheng Boong, Howard Yi Fan Sim, Gia Chuong Phan-Quang, In Yee Phang, Xing Yi Ling
Summary: This study demonstrates the use of multiple non-covalent interactions for ring complexation to enhance the affinity of gas molecules to a SERS platform, achieving rapid capture and multiplex detection. Stable ring complex formation is confirmed by experimental and in-silico studies, and kinetic investigations show a faster response time. By combining spectral concatenation and support vector machine regression, multiplex quantification of SO2 and NO2 is achieved with high accuracy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Spectroscopy
Chenghao Tang, Eungyeong Park, Shuang Guo, Sila Jin, Lina Zhao, Lei Chen, Young Mee Jung
Summary: Ag-ZnX composites coated on polystyrene arrays were fabricated using cosputtering technology. The doping of ZnX decreased the carrier densities and caused a redshift in the surface plasmon resonance of Ag. The study opens up a new path for designing metal-semiconductor composites with controllable carrier density.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Analytical
Chuhong Zhu, Qiangsheng Zhao, Xiujuan Wang, Zhongbo Li, Xiaoye Hu
Summary: In this study, a functional SERS system was developed for sensitive detection of target analytes using concentration of analyte molecules on or nearby plasmonic nanostructures. The composite film of Ag-nanocubes/graphene-oxide/Au-nanoparticles on a hydrophobic surface effectively accumulated analyte molecules for enhanced SERS activity. The system showed promising applications in food safety inspection and environmental pollutant monitoring.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Analytical
Ruipeng Chen, Yunfeng Sun, Bingyang Huo, Zefeng Mao, Xiaojuan Wang, Shiyu Li, Ran Lu, Shuang Li, Jun Liang, Zhixian Gao
Summary: A universal surface-enhanced Raman scattering (SERS) aptasensor was developed for the detection of Zearalenone (ZEN) with a linear detection range from 0.005 to 500 ng mL(-1) and a detection limit of 0.001 ng mL(-1). The sensor showed excellent performance for analytical applications with real-world samples.
ANALYTICA CHIMICA ACTA
(2021)
Article
Nanoscience & Nanotechnology
D. Jin, Y. Lee, C. Lee, M. H. Kim
Summary: This study successfully deposited 3-dimensional silver microstructures on a glassy carbon surface using programmed electrodeposition. The morphology-controlled silver deposits showed enhanced Raman signals and exhibited good reproducibility.
MATERIALS TODAY NANO
(2023)
Article
Chemistry, Analytical
Di Liu, Huimin Gao, Wenji Jiang, Su Yan, Hao Liu, Junjie Chen, Sisi Wen, Wei Zhang, Xu Wang, Bing Zhao, Wei Song
Summary: In this study, three-dimensional Ag aerogel-supported Hg single-atom catalysts were used as an efficient SERS substrate for monitoring enhanced oxidase-like reactions. The effect of Hg2+ concentrations on the SERS properties of 3D Hg/Ag aerogel networks was investigated, and an optimized addition of Hg2+ resulted in specific enhancement. The formation of Ag-supported Hg SACs was confirmed using HAADF-STEM imaging and XPS measurement, and the oxidase-like catalytic mechanism of Hg/Ag SACs was revealed using DFT. This research provides a mild synthetic strategy for fabricating Ag aerogel-supported Hg single atoms with promising prospects in various catalytic fields.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Lin Zhu, Zhu Mao, Peng Li, Menglei Xu, Zhen Meng, Lei Chen, Bing Zhao
Summary: This study discusses the influence of controllable carriers on localized surface plasmon resonance (LSPR) in (Ag)x(MoO3)y composites, as verified by SERS testing and UV-Vis-NIR absorption spectra. It was found that the LSPR absorption wavelength can be easily tuned from 950 to 735 nm by changing the sputtering power of MoO3. The relationship between carrier density and SERS intensity change caused by electromagnetic enhancement was investigated using Hall effect measurements. These findings provide insights into tunable LSPR and the contribution of electromagnetic effects to SERS.
JOURNAL OF MATERIOMICS
(2023)
