Article
Chemistry, Physical
Yanqiu Zou, Li Jiang, Tengfei Zhai, Tingting You, Xufeng Jing, Rongyang Liu, Fanghao Li, Wei Zhou, Shangzhong Jin
Summary: High-performance enhancement of Raman scattering is achieved through hierarchical CuS microflowers, with enhancement sensitivity proved to be related to the number and spacing of CuS petals and illumination of the incident wavelength. CuS microflowers serve as a high-performance SERS platform to expand the application field of SERS.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Shasha Zhao, Huiliu Wang, Lixin Niu, Wenqi Xiong, Yunxu Chen, Mengqi Zeng, Shengjun Yuan, Lei Fu
Summary: Surface-enhanced Raman scattering (SERS) based on 2D semiconductors has rapidly advanced, and 2D gallium nitride (GaN) with highly polar Ga-N bonds is demonstrated to be a sensitive SERS platform due to strong dipole-dipole interactions and abundant density of states near its Fermi level.
Article
Chemistry, Multidisciplinary
Enduo Feng, Tingting Zheng, Xiaoxiao He, Jinquan Chen, Qingyi Gu, Xiao He, Fanghao Hu, Jinghong Li, Yang Tian
Summary: Semiconductors have the potential to be used as surface-enhanced Raman scattering (SERS) substrates for the determination of biological species in complex living systems with high selectivity. However, their low sensitivity limits their practical applications compared to noble metal-based Raman enhancement. In this study, a novel Cu2O nanoarray with a high enhancement factor (EF) of 3.19x10(10) was developed, mainly attributed to plasmon-induced hot electron transfer (PIHET) in semiconductors. This Cu2O nanoarray was used as a highly sensitive and selective SERS chip for quantification of SARS-CoV-2 RNA, enabling rapid point-of-care testing of emerging virus variants.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Yumiao Dong, Qinhui Xie, Shuo Wu, Junbo Li, Lei Sun, Wei Ji
Summary: The adsorption mechanism of 4-MBA on TiO2 surfaces is found to be highly dependent on the exposure of acid sites, with preferential adsorption on Bronsted acid sites of a-TiO2 through a carboxyl group and on Lewis acid sites of c-TiO2 through a sulfhydryl group. Furthermore, 4-MBA molecules may form multilayer adsorption on TiO2 surfaces through hydrogen bonding and/or pi-pi stacking interactions. These findings provide new insights into the chemical enhancement mechanism for TiO2-4-MBA systems and offer theoretical guidance for the modification of TiO2 surfaces with organic molecules containing carboxyl and sulfhydryl groups.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Qingyou Liang, Xiangjun Gong, Jinchao Liu, Changming Ke, Jie Dong, Guosheng Song, Pu Feng, Huakang Yu, Xianfeng Yang, Jie Cui, Chunlin Deng, Zhiyuan Li, Shi Liu, Guangzhao Zhang
Summary: This study presents a noninvasive approach called ionic-wind enhanced Raman spectroscopy (IWERS) incorporated with photobleaching (PB) for detecting fluorescent and vulnerable samples. The use of ionic wind and photobleaching enhances Raman signals and suppresses fluorescence, improving the signal-to-noise ratio. IWERS avoids sample pollution and destruction without substrates and high laser power, making it a promising tool for characterizations in various fields.
ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Shiyu Sun, Jingying Zheng, Ruihao Sun, Dan Wang, Guanliang Sun, Xingshuang Zhang, Hongyu Gong, Yong Li, Meng Gao, Dongwei Li, Guanchen Xu, Xiu Liang
Summary: Defect-containing monolayer MoS2 with abundant density of states and effective photoinduced charge transfer resonance becomes a promising and versatile substrate capable of detecting a wide range of dye molecules and enhancing Raman enhancement.
Article
Materials Science, Multidisciplinary
Wei Liu, Zihan Wang, Xianghu Tang, Zhongping Liu, Ying Xiong, Xin Zhou, Guoxiang Zhu, Zhiyang Zhao, Wenqian Yan, Lingyan Shi, Longjin Huang, Yu Liu, Sheng Cui, Xuan He
Summary: Recent advances in surface-enhanced Raman scattering (SERS) on semiconductor substrates have improved selectivity and cost efficiency. This study proposes a new strategy of developing semiconductor substrates based on aerogels, such as TiO2 aerogels, to generate and enhance multiresonant interband charge transfer pathways for intrinsically activated SERS. The aerogel-based SERS shows wide applicability for ultrasensitive detection of explosives and organic dyes, and provides a new approach for constructing low-cost and high-sensitivity SERS substrate materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Mingze Li, Yunjia Wei, Xingce Fan, Guoqun Li, Qi Hao, Teng Qiu
Summary: The study demonstrates that T-shaped mixed-dimensional SnSe2/ReS2 vdWHs can be used as ultra-sensitive HERS chips, improving the detection limit of rhodamine 6G to femtomolar level and allowing for sensitive screening of crystal violet in multicomponent solutions. The mixed-dimensional vdWHs show great application potential in enhancing Raman scattering signals.
Article
Chemistry, Inorganic & Nuclear
Xiangyu Meng, Jian Yu, Jingjing Wu, Yuening Wang, Xiaoyu Song, Ziyan Xu, Anran Li, Lin Qiu, Jie Lin, Xiaotian Wang
Summary: Ag-loaded iron hydroxide (Ag/Fe(OH)(3)) was designed as an excellent surface-enhanced Raman scattering (SERS) substrate for trace detection of carcinogenic aromatic amine p-aminoazobenzene (PAAB). The Ag/Fe(OH)(3) exhibits prominent adjustability of properties, including localized surface plasmon resonance (LSPR) and energy band structure, achieving an enhancement factor (EF) of 1.23 x 10(6) for 4-ATP molecules through the synergistic interaction of LSPR and photo-induced charge transfer (PICT). Importantly, Ag/Fe(OH)(3) has an ultra-low detection limit for PAAB (10(-9) M), which is of great significance for trace detection of carcinogenic aromatic amines.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Faezeh Mohaghegh, Alireza Mazaheri Tehrani, Arnulf Materny
Summary: The increase in inelastically scattered signal observed in Surface-enhanced Raman spectroscopy (SERS) is attributed to different mechanisms. The study revealed a transition to pure electromagnetic enhancement when molecules are separated from the metal surface. By preventing direct contact between molecules and the metal surface, the electronic (chemical) enhancement mechanism can be switched.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Junzhi Ye, Rakesh Arul, Michel K. K. Nieuwoudt, Junzhe Dong, Ting Zhang, Linjie Dai, Neil C. C. Greenham, Akshay Rao, Robert L. Z. Hoye, Wei Gao, M. Cather Simpson
Summary: Photoinduced enhanced Raman spectroscopy (PIERS) is a new surface enhanced Raman spectroscopy (SERS) modality with a 680% Raman signal enhancement of adsorbed analytes over that of SERS. In this study, the atomic-scale mechanism behind PIERS is elucidated using various spectroscopic and simulation techniques. The key factor contributing to the PIERS enhancement compared to SERS is the increase in Raman polarizability of the adsorbed analyte through photoinduced charge transfer. This work provides insights for the rational design of PIERS substrates for sensing applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ben Yang, Gong Chen, Atif Ghafoor, Yu-Fan Zhang, Xian-Biao Zhang, Hang Li, Xiao-Ru Dong, Rui-Pu Wang, Yang Zhang, Yao Zhang, Zhen-Chao Dong
Summary: We investigated the chemical effects on Raman signals in surface enhanced Raman spectroscopy (SERS) through tip-enhanced Raman spectroscopy (TERS) of a single planar ZnPc molecule with controlled contact environments. TERS signals were enhanced when a tip-molecule point contact was made, due to the generation of a ground-state charge-transfer induced vertical Raman polarizability and the strong vertical plasmonic field in the nanocavity. However, TERS signals were quenched when ZnPc was chemisorbed flatly on substrates, attributed to the Raman polarizability screening effect induced by interfacial dynamic charge transfer.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Xingce Fan, Penghua Wei, Guoqun Li, Mingze Li, Leilei Lan, Qi Hao, Teng Qiu
Summary: By using the hot-electron injection strategy, a heterojunction array composed of plasmonic MoO2 and semiconducting WO3-x was designed to achieve unprecedented enhanced PICT efficiency between substrates and molecules. This approach not only achieved a record Raman enhancement factor among metal oxide substrates, but also enabled the ultrasensitive detection of target molecules.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Shuang Guo, Sila Jin, Eungyeong Park, Lei Chen, Zhu Mao, Young Mee Jung
Summary: Understanding and controlling the disorder in materials, especially caused by structural composition and doping effects, is crucial to studying the optical characteristics. In this study, a SiO2 -Ag-rGO composite structure was prepared, where the introduction of Si atoms controlled the plasmon effect of Ag nanoparticles and the defect concentration of rGO. This control facilitated charge separation and transfer, and adjustments in defect concentration impacted the energy band position of rGO for charge transfer resonance coupling.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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
Chemistry, Physical
Dong Won Yang, Keundong Lee, Suhee Jang, Won Jun Chang, Su Han Kim, Jae Hyung Lee, Gyu-Chul Yi, Won Il Park
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Chemistry, Physical
Arpana Agrawal, Joon Young Park, Pratima Sen, Gyu-Chul Yi
APPLIED SURFACE SCIENCE
(2020)
Article
Nanoscience & Nanotechnology
Dong Won Yang, Keundong Lee, Suhee Jang, Won Jun Chang, Su Han Kim, Jae Hyung Lee, Gyu-Chul Yi, Won Il Park
Article
Materials Science, Multidisciplinary
Youngbin Tchoe, Janghyun Jo, HoSung Kim, Heehun Kim, Hyeonjun Baek, Keundong Lee, Dongha Yoo, Won Jun Choi, Miyoung Kim, Gyu-Chul Yi
Summary: This study demonstrates the monolithic integration of InAs nanorods and ZnO nanotubes using a multilayer graphene film as the substrate, leading to the fabrication of dual-wavelength photodetectors. The hybrid nanostructures, grown by metal-organic vapor-phase epitaxy and molecular beam epitaxy, show sensitivity to both ultraviolet and mid-infrared wavelengths, as verified by transmission electron microscopy, spectral photoresponse analysis, and current-voltage measurements.
NPG ASIA MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Minho S. Song, Hyeonjun Baek, Keundong Lee, Dongha Yoo, Kunook Chung, Jamin Lee, Hyungseok C. Moon, Byung Hun Lee, Hye Yoon Park, Gyu-Chul Yi
Summary: The experiment demonstrates the use of gallium nitride microrods for cell labeling, showing that the microrods taken up via endocytosis can maintain normal cellular activities and exhibit sharp laser emission peaks.
NPG ASIA MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Young Joon Hong, Rajendra K. Saroj, Won Il Park, Gyu-Chul Yi
Summary: This Perspective provides a review of current research activities on one-dimensional semiconductor nanostructures grown on two-dimensional nanomaterials for flexible electronic and optoelectronic device applications. The combination of excellent material characteristics of 1D nanostructures and good properties of 2D layers holds great potential for a wide range of applications in optoelectronics and electronics.
Article
Materials Science, Multidisciplinary
Puspendu Guha, Joon Young Park, Janghyun Jo, Yunyeong Chang, Hyeonhu Bae, Rajendra Kumar Saroj, Hoonkyung Lee, Miyoung Kim, Gyu-Chul Yi
Summary: We report on the heteroepitaxial growth of Sb2Te3-Bi2Te3 lateral heterostructures using molecular beam epitaxy. The lateral heterostructures were fabricated by growing Bi2Te3 islands on graphene substrates and laterally growing Sb2Te3 on the side facets of the nanostructures. Electron microscopy techniques and first-principles calculations were used to study the interface and topological properties of the heterostructures.
Article
Materials Science, Multidisciplinary
Anuj Kumar Singh, Kwangseok Ahn, Dongha Yoo, Seokje Lee, Asad Ali, Gyu-Chul Yi, Kunook Chung
Summary: In this study, we achieved van der Waals integration of micropatterned GaN LEDs onto foreign graphene films. The transferred LEDs showed reliable device performances and adhesive properties, allowing for wearability and homogeneous light emission under various bending conditions.
NPG ASIA MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Rajendra K. Saroj, Puspendu Guha, Sangmin Lee, Dongha Yoo, Eunsu Lee, Jamin Lee, Miyoung Kim, Gyu-Chul Yi
Summary: A study on the selective growth of hexagonal GaSe film on prepatterned graphene substrate and fabrication of photodetector array is presented. The growth behavior of GaSe and the performance of the fabricated GaSe-based photodetectors are investigated. The findings reveal the potential applications of GaSe in optoelectronic devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Applied
Shih-Po Chien, Yu-Chen Chang, Kristan Bryan Simbulan, Shantanu Saha, Yu-Fan Chiang, Rajendra K. Saroj, Gyu-Chul Yi, Shamsul Arafin, Ting-Hua Lu, Yann-Wen Lan
Summary: This study investigates the effects of polarized light on the optical properties of h-BN phonon modes using polarized Raman spectroscopy. The polarization-resolved Raman spectra reveal the symmetrical and broken symmetry nature of degenerate phonon modes induced by linearly and elliptically polarized light, respectively. Furthermore, a helicity exchange is observed between circularly polarized excitation and the resulting opposite circular polarization of scattered light from h-BN.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Hyeong-Yong Hwang, Hyeonjun Baek, Gyu-Chul Yi, Young-Dahl Jho
Summary: Strain occurs spontaneously at the interfaces of crystalline materials and needs a suitable characterization scheme to analyze multiple interfaces. Through the experiment, we found that surface strain has a stronger influence on photoluminescence spectra than quantum confinement effect. Particularly in the strongly tapered region, increasing surface strain leads to a significant increase in photoluminescence shift, which matches the analysis based on surface to volume ratio. Additionally, surface strain dependence on temperature contrasts with the temperature-invariant characteristics of quantum confinement.
Article
Multidisciplinary Sciences
Hongseok Oh, Gyu-Chul Yi, Michael Yip, Shadi A. Dayeh
Article
Multidisciplinary Sciences
Arpana Agrawal, Gyu-Chul Yi
Article
Chemistry, Multidisciplinary
Lin Sun, Chunrui Wang, Liu Xu, Jiale Wang, Xiaoyun Liu, Xiaoshuang Chen, Gyu-Chul Yi
Article
Chemistry, Multidisciplinary
Nam-Jung Kim, Jayeong Kim, Jun-Beom Park, Hyemin Kim, Gyu-Chul Yi, Seokhyun Yoon