Article
Chemistry, Multidisciplinary
Andrei Stefancu, Seunghoon Lee, Li Zhu, Min Liu, Raluca Ciceo Lucacel, Emiliano Cortes, Nicolae Leopold
Summary: This study highlights a new metal-molecule charge transfer process by tuning the Fermi energy of plasmonic silver nanoparticles (AgNPs) in situ. The strong adsorption of halide ions upshifts the Fermi level of AgNPs, promoting spontaneous charge transfer to molecular acceptor orbitals. The catalytic role of halide ions in plasmonic nanostructures depends on their surface affinity compared to the target molecule, providing new insights into the interaction mechanisms.
Article
Chemistry, Physical
Cai Wang, Xufeng Guo, Qun Fu
Summary: This study designed an ordered Ag/TiO2/Ni nanopillar arrays hybrid substrate and investigated the charge transfer process at the metal-semiconductor and substrate-molecule interface. The contribution of charge transfer enhancement to surface-enhanced Raman scattering (SERS) was determined by calculating the CT degree of the obtained SERS spectra, and a thickness-dependent CT enhancement mechanism was proposed.
Article
Chemistry, Physical
Cai Wang, Chunfang Zheng, Huaping Zhao, Qun Fu, Yong Lei
Summary: Semiconductors have been optimized in thickness to enhance their surface-enhanced Raman scattering (SERS) activity in noble metal/semiconductor SERS substrates. However, the influence of the strong surface plasmon resonance (SPR) effect from the noble metals has made it difficult to fully understand the charge transfer (CT) resonance mechanism caused by the change of the semiconductor thickness. This study systematically evaluates the CT mechanism by developing systems with precisely controlled TiO2 thicknesses, and demonstrates that a TiO2 thickness of 40 nm exhibits the highest SERS activity.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Xinlu Zheng, Xuefeng Yan, Jiayu Ma, Xinyun Yao, Jinlong Zhang, Lingzhi Wang
Summary: This study used operando SERS spectroscopy to investigate the electron transfer dynamics and direction at the Au/TiO2 interface, revealing the size-dependent unidirectional/bidirectional transfer of photoinduced electrons and enabling rational tuning of reduction selectivity in metal/semiconductor composites.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Qi Chu, Wei Wang, Shuang Guo, Eungyeong Park, Sila Jin, Yeonju Park, Lei Chen, Yucun Liu, Young Mee Jung
Summary: In this study, a three-dimensional Ag@ZnSe structure was formed by cosputtering Ag and ZnSe on a polystyrene template. The surface morphology and composition of the structure were controlled by adjusting the sputtering power of ZnSe, and the introduction of ZnSe also introduced a charge-transfer effect. The catalytic activity of the substrate was observed due to the charge-transfer effect, and the catalytic degradation of malachite green (MG) was successfully monitored using in situ surface-enhanced Raman scattering (SERS). The study provides insights into the synergistic effects of electromagnetic mechanism and charge transfer, as well as a new perspective on photocatalysis and catalytic process monitoring.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Mingfang Zhang, Qingjie Feng, Sheng Li, Guangjun Nan
Summary: This study investigates the light-triggered charge transfer across TiO2/MAPbI(3) interfaces using density functional theory (DFT) and time-dependent DFT approach. The study reveals that the electrostatic interactions between the ends of MA cations and the photogenerated electrons can enhance or weaken the charge transfer across the interfaces. Additionally, positively charged iodine vacancies at the interfaces tend to inhibit the light-induced charge transfer. The dipolar MA cations might have a dual effect on the hysteresis in PSCs with TiO2/MAPbI(3) interfaces.
Article
Nanoscience & Nanotechnology
Jieyi Cai, Zhezhe Wang, Siyi Jia, Zhuohong Feng, Yang Ren, Lin Lin, Guilin Chen, Zhiqiang Zheng
Summary: Highly ordered TiO2/Ag bilayer structures were fabricated on p-type silicon wafers using photolithography and electrochemical self-assembly methods. The interfacial charge transfer behavior of the Si/TiO2/Ag structure was studied, which is crucial for enhancing SERS performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Xin Jiang, Lin Xu, Wei Ji, Weie Wang, Juan Du, Libin Yang, Wei Song, Xiaoxia Han, Bing Zhao
Summary: The effects of electron-hole separation on the sensitivity of semiconductor-based surface enhanced Raman scattering (SERS) were investigated using TiO2/ZnO heterojunction as an example. The results showed that the formation of TiO2/ZnO heterojunction improved the separation of the photogenerated electron-hole pairs and significantly enhanced SERS activity. These findings provide insights into the role of electron-hole separation in semiconductor SERS enhancement and offer a new strategy for designing semiconductor SERS-active substrates with high charge transfer contribution.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Hua Li, Chao Ding, Dong Liu, Shota Yajima, Kei Takahashi, Shuzi Hayase, Qing Shen
Summary: This study used an ultrafast transient absorption technique to investigate the dynamics of charge transfer from MAPbI(3) quantum dots to the titanium dioxide charge transport layer. The results showed that the kinetics of this process depend on the size of the quantum dots. Additionally, a QD solar cell based on the MAPbI(3)/TiO2 junctions was fabricated, achieving a high power conversion efficiency of 11.03%, indicating its potential for high-performance solar cells.
Article
Materials Science, Multidisciplinary
Yingnan Quan, Xiang-Hu Tang, Wenjing Lu, Wang Huo, Zongyin Song, Wei Shen, Meng Yang, Xing-Jiu Huang, Wen-Qing Liu
Summary: This study proposes a new substrate material, CA-V-TiO2, which achieves energy level matching and charge-transfer resonance through the regulation of vacancies and amorphous state, optimizing the performance of SERS substrate. The CA-V-TiO2 substrate enables sensitive detection of chloramphenicol with low detection limit, good reproducibility, and high stability.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dongxue Yu, Lin Xu, Huizhu Zhang, Jia Li, Weie Wang, Libin Yang, Xin Jiang, Bing Zhao
Summary: In this study, CuO/TiO2 p-n heterojunction was developed as a new substrate for surface enhanced Raman scattering (SERS) to amplify the Raman signal of 4-mercaptobenzoic acid (4-MBA) molecule. The heterojunction-molecule system exhibits enhanced SERS performance due to the electron injection from CuO to TiO2 and improved photogenerated carrier separation efficiency through interfacial coupling. The substrate demonstrates excellent SERS detection sensitivity towards 4-MBA with a low detection limit and high enhancement factor.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Analytical
Huan Wang, Mingxuan Dong, Baorui Shao, Yaodan Chi, Chao Wang, Sa Lv, Ran Duan, Boqi Wu, Xiaotian Yang
Summary: N-TiO2/Ni(OH)(2) nanofiber was successfully prepared using electrospinning and solvothermal method. It showed excellent photodegradation activity for rhodamine B under visible light irradiation, with an average degradation rate of 3.1%/min(-1). The high activity was mainly attributed to the heterostructure-induced increase in charge transfer rate and separation efficiency.
Article
Materials Science, Multidisciplinary
Jingwen Du, Ruobi Zhu, Luye Cao, Xinrui Li, Xiaoyang Du, Hui Lin, Caijun Zheng, Silu Tao
Summary: In this paper, a layer-by-layer (LbL) spin-coating method combined with a ternary strategy is used to achieve high-performance OSCs based on the PM6/N3 system. Compared with BHJ OSCs, LbL OSCs achieve ideal morphology tuning and increase the highest power conversion efficiency (PCE) from 15.72% to 16.94%. By introducing the polymer PTO2 into the active layer, a donor alloy is formed, facilitating charge transfer and enhancing device stability. The ternary LbL OSCs have vertically distributed structures which inhibit bimolecular recombination, resulting in an optimum PCE of 17.90%.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Jian Yu, Chao Chen, Qinghua Zhang, Jie Lin, Xiuyi Yang, Lin Gu, Hui Zhang, Zhi Liu, Yu Wang, Shuo Zhang, Xiaotian Wang, Lin Guo
Summary: This study discovered a single-atom enhanced Raman scattering (SAERS) effect based on noble metal single atoms anchored on amorphous C3N4 nanosheets. The SAERS effect exhibited excellent spectral stability and reproducibility, making it promising for applications in the field of enhanced Raman spectroscopy.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Applied
Veronika Stara, Pavel Prochazka, Jakub Planer, Azin Shahsavar, Anton O. Makoveev, Tomas Skala, Matthias Blatnik, Jan Cechal
Summary: This study introduces monolayer-thick charge-injection layers based on aromatic carboxylic acids, which can induce an energy-level shift of up to 0.8 eV in subsequent layers, with a highly tunable range of 0.5 eV. The results show that the work function and energy-level positions of the charge-injection layers increase linearly with the density of induced dipoles, and the energy-level positions of subsequent layers follow the changes in the charge-injection layers.
PHYSICAL REVIEW APPLIED
(2022)
Article
Engineering, Environmental
Hao Liu, Yue Guo, Yunxin Wang, Huidan Zhang, Xiaowei Ma, Sisi Wen, Jing Jin, Wei Song, Bing Zhao, Yukihiro Ozaki
Summary: The fabrication of Au-NiFe layered double hydroxide/rGO nanocomposite enables efficient degradation and removal of organic mercury in industrial wastewater, with high sensitivity and environmental and economic advantages.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Optics
Wenyan Wang, Ning Sui, Zhihui Kang, Qiang Zhou, Li Li, Xiaochun Chi, Hanzhuang Zhang, Xing He, Bing Zhao, Yinghui Wang
Summary: This study investigates the hot carrier dynamics in the C excitonic state of monolayer WS2 using transient absorption spectroscopy. The hot carrier cooling lifetime increases with the absorbed photon flux, exhibiting a distinct spectral feature compared to normal carriers. The results provide insights into the behavior of hot carriers in 2D TMDCs and offer guidance for designing high-performance TMDC-based electronic devices.
Article
Spectroscopy
Xiangxin Xue, Lei Chen, Chunxu Wang, Cuimei Zhao, Hairui Wang, Ning Ma, Jiahui Li, Yu Qiao, Limin Chang, Bing Zhao
Summary: The PS/Ag/ZIF-8 substrate showed outstanding SERS performance when 4-MBA was used as the probes, attributed to the combined effect of electromagnetic enhancement and chemical enhancement. The sandwich PS/Ag/ZIF-8 substrate exhibited a laser wavelength-dependent CT effect.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Analytical
Yue Wang, Cheng Cheng, Ruofei Ma, Zhangrun Xu, Yukihiro Ozaki
Summary: Visualization of signaling molecules in single living cells is crucial for understanding cellular metabolism and physiology. This study proposed a label-free nanosensor strategy based on surface-enhanced Raman scattering (SERS) spectroscopy for in situ imaging of intracellular H2O2 in single living cancer cells.
Article
Chemistry, Physical
Shiyu Zhao, Jian Wu, Xiaochun Chi, Ning Sui, Zhihui Kang, Qiang Zhou, Han-zhuang Zhang, Bing Zhao, Yinghui Wang
Summary: The investigation of CsPbBr3 nanorods and cubic CsPbBr3 nanocrystals reveals the anisotropic properties of CsPbBr3 nanorods, with their photoluminescence intensity and radiative lifetime being sensitive to the polarization direction. Additionally, CsPbBr3 nanorods display two-photon fluorescence. These findings provide comprehensive insights into the optoelectronic properties of inorganic halide perovskite nanomaterials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Lin Zhu, Peng Li, Huanhuan Sun, Xiaoxia Han, Yitong Xu, Xiaolei Wang, Bingbing Liu, Yukihiro Ozaki, Bing Zhao
Summary: The study investigates the impact of high pressure on the charge transfer probability in DSSCs, showing that changes in band gap induced by high pressure can enhance CT processes. Additionally, the introduction of Ag NPs in the DSSC system enhances light trapping ability and offers additional CT pathways, potentially improving photoelectric conversion efficiency.
Article
Spectroscopy
Meng Zhang, Yanan Wang, Yan Ma, Xu Wang, Bing Zhao, Weidong Ruan
Summary: In this study, a series of antimony-doped tin oxide nanoparticles were synthesized and used as SERS substrates for the first time, revealing a dependence of the SERS enhancement on the doping ratios. The research indicates a connection between the enhancement effect and the variation of optical band gap energy and free charge carrier densities in conduction bands of the nanoparticles. This provides a new perspective for the development of semiconductor-based SERS substrates and contributes to the understanding of the SERS charge transfer mechanism.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Xin Jiang, Lin Xu, Wei Ji, Weie Wang, Juan Du, Libin Yang, Wei Song, Xiaoxia Han, Bing Zhao
Summary: The effects of electron-hole separation on the sensitivity of semiconductor-based surface enhanced Raman scattering (SERS) were investigated using TiO2/ZnO heterojunction as an example. The results showed that the formation of TiO2/ZnO heterojunction improved the separation of the photogenerated electron-hole pairs and significantly enhanced SERS activity. These findings provide insights into the role of electron-hole separation in semiconductor SERS enhancement and offer a new strategy for designing semiconductor SERS-active substrates with high charge transfer contribution.
APPLIED SURFACE SCIENCE
(2022)
Article
Hematology
Qinglian Wang, Jiangong Lin, Hui Han, Dongfeng Wu, Yan Zhou, Bing Zhao
Summary: This study found that preoperative cardiac index is associated with the maturation and patency of radiocephalic arteriovenous fistula. A decreased cardiac index may be a predictor of an increased risk of failed maturation and a shorter primary patency time.
BLOOD PURIFICATION
(2022)
Article
Engineering, Environmental
Jing Jin, Wei Song, Jiaqi Wang, Linjia Li, Yu Tian, Shoujun Zhu, Yuping Zhang, Shuping Xu, Bai Yang, Bing Zhao
Summary: A uniform and small-sized core-shell Ag/oxidized graphene quantum dots (o-GQDs) nanohybrid with enhanced SERS sensitivity and biocompatibility was prepared for intracellular SERS analysis and potential cancer cell therapy.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yanan Wang, Jing Jin, Hao Ma, Meng Zhang, Qianwen Li, He Wang, Bing Zhao, Weidong Ruan, Guan Yan
Summary: This study investigates the importance of enhancing charge transfer in the AZO/MPy/Ag sandwich structure, and identifies a significant CT route from the CB of AZO to the LUMO of the MPy molecule, which can effectively improve the degree of CT. This discovery is expected to play a crucial role in enhancing SERS.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Spectroscopy
Yan Ma, Qianwen Li, Siyu Wang, Yanan Wang, Hongye Liu, Xu Wang, Bing Zhao, Ziping Jiang, Weidong Ruan
Summary: The application of surface enhanced infrared absorption (SEIRA) is limited by the use of expensive noble metal substrates. This study introduces a new semiconductor SEIRA substrate, indium tin oxide (ITO) nanoparticles, and demonstrates their SEIRA property. Furthermore, the results show that the doping ratio of tin heteroatoms in ITO nanoparticles affects the enhancement factor.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Review
Chemistry, Multidisciplinary
Yawen Liu, Hao Ma, Xiao Xia Han, Bing Zhao
Summary: SERS has become an important tool in chemical analysis, materials science, and biomedical research. The development and application of metal-semiconductor heterostructures in SERS research have shown great potential for diverse applications and advancement in photovoltaic devices and chemical/biological sensing. The unique photoelectric properties and giant SERS signals of metal-semiconductor heterostructures contribute to their significant role in enhancing light harvesting and conversion.
MATERIALS HORIZONS
(2021)
Article
Chemistry, Multidisciplinary
Linjia Li, Jing Jin, Junjun Liu, Jin Yang, Wei Song, Bai Yang, Bing Zhao
Summary: Excited carriers and heat energy from plasmonic metal nanomaterials play a crucial role in enhancing photocatalytic performance. The Ag@CDs hybrid exhibits excellent Fenton-like photocatalytic and photothermal conversion properties under full solar spectrum irradiation, with insights gained into the plasmon-mediated photocatalytic mechanism.
Article
Spectroscopy
Lin Zhu, Hao Ma, Wei Song, He Wang, Peng Li, Chao Ma, Jiawei Wu, Lin Guo, Bing Zhao
Summary: Intercalation of BPE into PbI2 was studied through Raman spectroscopy, SEM, XRD, UV-Vis absorption spectrum, and EDS. The results show a new crystal structure and chemical interaction, as well as specific adsorption of BPE by PbI2, indicating potential new applications and improved understanding of PbI2 structure.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
