Article
Chemistry, Physical
Meenu Sharma, Sonam Rani, Devesh K. Pathak, Ravi Bhatia, Rajesh Kumar, I Sameera
Summary: A temperature dependent Raman spectromicroscopic study was conducted on multiwall carbon nanotubes to investigate anharmonic effects, revealing non-linear shifts in the peak position of Raman D- and G-bands with temperature. Phonon softening and hardening of Raman modes were observed over a wide temperature range, with the G-peak shift explained by anharmonic properties of the graphite lattice. The width variation of the G-peak appeared to be nearly independent of temperature due to competing effects from electron-phonon coupling and anharmonic contributions.
Article
Chemistry, Physical
Swayam Kesari, Rekha Rao, Samatha Bevara, S. N. Achary
Summary: The study reveals multiple structural phase transitions of metastable Zn4V2O9 under high pressure, some of which are reversible and some are irreversible; as pressure increases, Raman spectra show an increase in coordination of vanadium atoms and features of structural disorder.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Shi-Qi Hu, Hui Zhao, Chao Lian, Xin-Bao Liu, Meng-Xue Guan, Sheng Meng
Summary: This study explores light-modulated electron-phonon coupling in photoexcited graphene, demonstrating a significant enhancement by modulating the density and distribution of photocarriers. The findings provide insights into ultrafast electron-phonon coupling and its real-time tracking.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Physical
Jing Yu, Zhonglin Li, Jie Jiang, Wenjun Liu, Shuai Guo, Yao Liang, Bo Zhong, Yingying Wang, Mingqiang Zou
Summary: In this work, temperature-dependent polarized Raman spectroscopy was used to investigate the anisotropic thermal properties of atomically thin ReS2 flakes. It was found that the Raman modes of ReS2 redshift with increasing temperature and that the temperature coefficients differ along different crystal axes. Additionally, the broadening of phonon modes was attributed to phonon decay. This study will contribute to the understanding of thermal anisotropy in two-dimensional anisotropic materials.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Mohsen Sabbaghi, Tobias Stauber, Hyun-Woo Lee, J. Sebastian Gomez-Diaz, George W. Hanson
Summary: This work investigates the in-plane optical phonon modes of current-carrying single-layer graphene and identifies the effects of DC current on the frequency shifts and the breaking of rotational symmetry.
Article
Optics
Shiran Levy, Nathalie Lander Gower, Silvia Piperno, Sadhvikas J. Addamane, John L. Reno, Asaf Albo
Summary: We propose a highly diagonal split-well resonant-phonon (SWRP) active region design for GaAs/Al0.3Ga0.7As terahertz quantum cascade lasers (THz-QCLs). The design successfully suppresses thermally activated leakage channels, as evidenced by the observation of negative differential resistance at room temperature. The reduced overlap between the doped region and the active level states improves the performance of the laser.
Article
Chemistry, Multidisciplinary
Jean-Francois Bryche, Marlo Vega, Agnes Tempez, Thibault Brule, Thomas Carlier, Julien Moreau, Marc Chaigneau, Paul G. Charette, Michael Canva
Summary: This work demonstrates the enhancement in plasmonic sensing efficacy by spatially-localized functionalization on nanostructured surfaces, where probe molecules are concentrated in areas of high field concentration. SERS measurements on nanostructured surfaces with homogeneous and spatially-localized functionalization with thiophenol show that the Raman signal mainly originates from high field concentration areas. TERS measurements with 10 nm spatial resolution confirm the predicted field distribution profiles.
Article
Materials Science, Multidisciplinary
Youning Gong, Yanyu Zhao, Zhichao Zhou, Delong Li, Hu Mao, Qiaoliang Bao, Yupeng Zhang, Guo Ping Wang
Summary: The recent discovery of in-plane hyperbolic phonon polaritons in biaxial polar crystal-alpha-MoO3 has sparked a surge of research interest in anisotropic photonic quasiparticles in van der Waals materials. This study systematically investigates the anisotropic photo-phonon interactions in alpha-MoO3 using in situ angle-resolved polarized Raman spectroscopy, providing a better understanding of the anisotropic phonon modes in alpha-MoO3 and serving as a valuable reference for other anisotropic van der Waals crystals.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Gan-Yu Chen, Yi-Bin Sun, Pei-Chen Shi, Tao Liu, Zhi-Hao Li, Si-Heng Luo, Xin-Chang Wang, Xiao-Yu Cao, Bin Ren, Guo-Kun Liu, Liu-Lin Yang, Zhong-Qun Tian
Summary: Interfacial host-guest complexation is a versatile way to functionalize nanomaterials, but the study of it is difficult due to the complicated interfacial environment. Using surface-enhanced Raman spectroscopy (SERS), a cooperative effect between CB[7] and MV2+ on aggregating Au NPs was revealed, along with similar guest complexations among CB[n]s and MV2+. This unconventional exclusive complexation model provides new insights into host-guest interactions at nanostructured interfaces, which could be beneficial for applications in engineered nanomaterials.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Chemistry, Physical
Adela Hankova, Anna Kuzminova, Jan Hanus, Petr Sezemsky, Radka Simerova, Vitezslav Stranak, Katarzyna Grochowska, Dujearic-Stephane Kouao, Katarzyna Siuzdak, Marek Prochazka, Tereza Kosutova, Ondrej Kylian
Summary: In this study, Ag/TiO2 coatings with different architectures were prepared using plasma-assisted techniques, and their SERS performance was investigated and compared. Nanoislands enhance the SERS signal, TiO2 degrades surface contaminants, and the photoactivity of titania enables the recycling of substrates. Nanostructured Ag/TiO2 coatings with larger active surface area show a good compromise between high detection limit and recyclability, allowing for the detection of methylene blue at low concentrations and easy cleaning by UV radiation.
SURFACES AND INTERFACES
(2022)
Article
Physics, Applied
Qiyun Xie, Shengjing Hu, Chengxiang Hu, Qidi Sheng, Limin Chen, Jiajin Zheng, Wei Wang, Ligang Ma, Guofeng Cheng
Summary: By using angle-resolved polarized Raman spectroscopy and first-principles calculations, the Raman modes of bulk FePSe3 were identified, clarifying the ambiguity about the symmetry identification of certain Raman-active modes. Through temperature-dependent Raman scattering experiments, abnormal changes in frequency, linewidth, and integrated intensity were observed for phonon modes associated with a non-magnetic [P2Se6](4-) cluster across the Neel temperature. These findings can be explained by the spin-phonon coupling mechanism and provide insights into the physics of FePSe3 and magnetic van der Waals materials in the 2D limit.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Kaijie Wu, Yong He, Mengda Cui, Zhikai Yang, Yifang Yuan, Qiankun Zhao, Wenyu Peng
Summary: In this paper, we investigate the suppression of macroscopic polarization fields and alterations in phonon frequencies under strong electric fields in high-power III-nitride semiconductor devices. The vibration frequencies of the LO A1(LO) mode in 2H-GaN and 2H-AlN decrease by approximately 2 cm-1 and 3 cm-1, respectively. The simulation results are supported by Raman spectroscopy results of Si-doped 2H-GaN specimens. This study provides insights into the factors influencing phonon behavior and offers new methods for optimizing thermal regulation and dissipation in III-nitride semiconductor materials and devices.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Bojan Stojadinovic, Dejan M. Djokic, Novica Paunovic, Ivica Zivkovic, Luka Ciric, Vladan Kusigerski, Zorana Dohcevic-Mitrovic
Summary: The temperature dependence of two-phonon Raman spectra in BiFeO3 nanocrystals above and below the Neel temperature T-N was studied using a resonant laser excitation line. Anomalous frequency hardening and deviation from anharmonic decay were observed below T-N, indicating the existence of spin-phonon interaction. Magnetic measurements showed the coexistence of antiferromagnetic and weak ferromagnetic phases below T-N, supporting the mean-field approach and suggesting a correlation between two-phonon modes and antiferromagnetic ordering in BiFeO3.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Chemistry, Physical
Joanna Jadczak, Janusz Andrzejewski, Joerg Debus, Ching-Hwa Ho, Leszek Bryja
Summary: Germanium monosulfide with an anisotropic puckered crystalline structure has unique optical and electronic properties, but the understanding of exciton-phonon interactions is limited. In this study, we investigate the resonant Raman scattering and photoluminescence of the optically active Gamma-exciton in layered GeS flakes, revealing the coupling between phonons and photogenerated carriers as well as the efficiency of multiorder scattering in optical processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Letter
Chemistry, Physical
Joanna Jadczak, Janusz Andrzejewski, Joerg Debus, Ching-Hwa Ho, Leszek Bryja
Summary: Germanium monosulfide with a puckered crystalline structure has unique optical and electronic properties, which have attracted much attention. However, the interactions between excitons and phonons have not been fully understood. In this study, we investigated the resonant Raman scattering and photo-luminescence of the optically active Gamma-exciton in layered GeS flakes. We found that there is a considerable coupling between phonons and photogenerated carriers in GeS flakes, and multiorder scattering plays an important role in optical processes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Biophysics
Hao Ma, Songlin Liu, Yawen Liu, Jinyu Zhu, Xiao Xia Han, Yukihiro Ozaki, Bing Zhao
Summary: The presented method utilizes intrinsic Raman vibrational information of phosphorylated residues to develop an antibody and label-free approach for fingerprinting protein phosphorylation. Through surface-enhanced Raman scattering spectroscopy and an immobilized-metal affinity strategy, this ultrasensitive method can successfully discriminate single-site phosphorylated residues in proteins, demonstrating potential for both fundamental research and clinical applications.
BIOSENSORS & BIOELECTRONICS
(2021)
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, 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)
Article
Nanoscience & Nanotechnology
Lin Guo, Zhu Mao, Chao Ma, Jiawei Wu, Lin Zhu, Bing Zhao, Young Mee Jung
Summary: Nanoscale materials have unique advantages in solar energy utilization due to their perfect match with visible light wavelength. The study investigated the charge transfer process between gold nanorods and Cu2O using surface-enhanced Raman scattering spectroscopy, revealing the influence of plasmon absorption at different incident Raman laser lines. By analyzing the SERS spectra, the degree of charge transfer was calculated, with implications for improving photocatalytic efficiency and photoelectric devices.
ACS APPLIED NANO MATERIALS
(2021)
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.
