Journal of Physical Chemistry C
·
2015
·
IF 4.772
Jingjing Hao,Ting Liu,Yingzhou Huang,Guo Chen,Anping Liu,Shuxia Wang,Weijia Wen
The electromagnetic field redistribution in metal nanostructure–film systems exhibits great capability of confining light on plain film, which has great significance in surface-enhanced Raman scattering (SERS) of a molecule on plain film or 2D material. In this work, the SERS spectra of a monolayer molecule on metal or dielectric film were investigated with the help of a metal nanoparticle–nanowire structure. The results indicated that SERS intensity from an adjacent nanoparticle was much greater than that from an individual nanowire, which was confirmed by the simulated electric field distribution through finite method. The polarization dependence of both experimental and simulated data pointed out the importance of electromagnetic field redistribution in this phenomenon. Furthermore, the shape independence of a nanoparticle found in this work greatly improved the application prospect of this nanoparticle–nanowire assisted SERS on film.
研究领域:
材料科学
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·Vol. 13
·期 10
·2402968
·
IF 7.2
Lei Yao,Yunjia Wei,Xing Zhao,Xiangnan Zhu,Dexiang Chen,Xiao Tang,Xingce Fan,Teng Qiu,Qi Hao
Plasmonic catalysis employs nanomaterials to mediate the conversion of photon energy into localized electromagnetic fields, hot carriers, and thermal energy, facilitating molecular transformations under mild conditions. Understanding the mechanisms governing plasmonic effects is crucial for optimizing the yield and selectivity in plasmonic catalysis. However, challenges persist in elucidating the role of plasmonic field effects due to the complex interactions among various contributing mechanisms. This study introduces Au@Al 2 O 3 -Pd-Au@Al 2 O 3 trimer arrays to decouple plasmonic field effects from other influences. The alumina coating on the Au particles prevents charge transfer between gold and reactants, enabling focused examination of the field effects on Pd catalysts. Employing real-time monitoring with liquid-state surface-enhanced Raman scattering (SERS), this work investigates the catalytic efficiency and kinetics of the C─C coupling reactions on palladium by tuning the near-field strengths. Polarization-dependent studies reveal that strong near-field intensity around the trimer structures is amplified by ≈60-fold under optimized conditions. The findings offer insights for optimizing catalytic reaction conditions and designing more effective composite plasmonic catalysts.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 8
·2101973
·
IF 10.05
Yan Zhao,Shuo-Hui Cao,Jia-Dai Wang,Na Li,Guo-Chun Lin,Yao-Qun Li
Probing light−matter interactions at the nanoscale is essential for elucidation of their fundamentals and construction of novel nano-optical devices. In this work, it is proposed that polarization- and angle-dependent plasmonic synchronous fluorescence spectroscopy could be powerful to resolve UV–vis plasmon mediated molecular couplings, even under vibrational sublevels. Taking studies of polycyclic aromatic hydrocarbons (PAHs, one general class of graphene analogs with emission range of 350–550 nm) as demonstration, a simple but efficient device of PAHs nanolayer (with thickness in tens to hundreds of nanometers) on an Al nano-film is fabricated. By synchronously scanning excitation and emission wavelengths in a high resolution to depict polarization- and angle-dependent spectrographic profiles, the vibrational transitions coupled to the Al plasmons could be identified, while these could not be attained by conventional fluorescence measurement. As a result, the featured molecular vibrational couplings for both surface plasmon- and plasmonic waveguide-mediated PAHs–Al interactions have been successfully observed at room temperature. Even toward crowded and overlapped spectral components containing multiple vibrations, the transitions could be individually distinguished. These efforts will contribute to the further exploitation and construction of efficient light-emitting devices via luminant molecules on a metal surface.
研究领域:
光学
·
纳米科技
·
材料科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Wen-Shuai Jiang,Wei Xin,Shuang Xun,Shao-Nan Chen,Xiao-Guang Gao,Zhi-Bo Liu,Jian-Guo Tian
A sensitive and selective optical biosensor based on reduced graphene oxide (RGO), which uses the polarization-dependent absorption effect of graphene under total internal reflection, is reported for determination of rabbit IgG. RGO sheets with the thickness of about 8.1 nm are fabricated by high temperature reduction and used as a sensing film, because of its strong polarization dependent absorption. This RGO-based optical sensor shows a satisfactory response to rabbit IgG with a minimum concentration of 0.0625 μg/ml. As a contrast, commercial SPR apparatus is used to investigate rabbit IgG with a minimum concentration of 0.3125 μg/ml. Moreover, with antigen–antibody binding, this sensor can also achieve label-free and real-time detection. Taking into account these factors, the RGO-based optical sensor may be a potential candidate for biosensing.
研究领域:
材料科学
·
生物传感器
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2025
·Vol. 17
·期 39
·23129-23138
·
IF 5.1
Mengya Li,Xinhui Yang,Chang Lu,Meili Long,Zhihui Chen,Haitao Chen,Xiaoming Yuan,Jun He
Anisotropic van der Waals (vdW) heterostructures are crucial for smart optoelectronic device development. Although transition metal dichalcogenides (TMDCs) like WS2 hold great potential for high-performance optoelectronic devices, their C3 rotational symmetry restricts polarization-sensitive applications. Crystal symmetry breaking of TMDCs by forming heterostructures is a powerful approach for achieving anisotropic optoelectronic properties. Considering the promising potential of the WS2/Te p–n heterostructure in broad photoresponse and enhanced nonlinearity, we successfully fabricated this heterostructure and investigated its anisotropic optical properties. The formation of the heterostructure induces interfacial symmetry breaking, and the interface shows twofold symmetry as confirmed by polarization-dependent second-harmonic generation (SHG) measurements. Moreover, the WS2/Te heterostructure exhibits enhanced SHG signals across the 850–1064 nm wavelength range. The interlayer anisotropic moiré potential induced by symmetry breaking leads to anisotropic Raman scattering and exciton emission with degrees of polarization (DOP) of 0.268 and 0.310. Furthermore, the heterostructure formation reduces intervalley scattering, enhancing valley polarization in WS2. In particular, the valley polarization degree of the trion in the heterostructure is 0.495 at 93 K. These results demonstrate the potential of the WS2/Te heterostructure for strong nonlinear optical responses and anisotropic optoelectronic properties, establishing a foundation for their broad application in next-generation photonic devices.
研究领域:
光电子学
·
纳米光子学
·
材料科学
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非线性光学
·
凝聚态物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 16
·2009916
·
IF 18.808
Ruilian Chen,Dengchong Feng,Guojian Chen,Xudong Chen,Wei Hong
The construction of invisible patterns via high-resolution printing and the independent encoding/decoding of complex information can lead to promising applications in steganography and watermarking for optical encryption. Herein, a rewritable chiral photonic paper formed by cholesteric cellulose nanocrystals and polycation is reported. The chemically crosslinked polycation network interpenetrates in the cholesteric structure while retaining the optical properties of the photonic crystals. The film exhibits controllable wettability via anion exchange, leading to extremely low contrast in the dry state but high contrast by a rapid wetting response. Triple invisible information is independently encoded on the films, including invisible patterns caused by reversible counterion-controlled wettability, permanent fluorescent labels based on fluorescent counterions, and polarization-dependent structural colors based on cholesteric structures. Full color patterns can be reversibly constructed via inkjet printing, with a high resolution of 100 µm. In addition, the circular polarization characteristics of the cellulose nanocrystals, liquid crystals, endow the system with complex and independent responses, realizing a wetting/polarization double-key decryption. This work provides a simple and effective optical technique for coding complex information on a single material platform and expands the techniques available to achieve invisible patterns for sensing and anti-counterfeiting.
研究领域:
材料科学
·
光学
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纳米技术
·
密码学
·
安全
✓ 已验证
产品关联
DOI
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 4
·548-563
·
IF 6.099
Bin Wang,Chen Zhao,Huanyu Lu,Tingting Zou,Subhash C. Singh,Zhi Yu,Chaonan Yao,Xin Zheng,Jun Xing,Yuting Zou,Cunzhu Tong,Weili Yu,Bo Zhao,Chunlei Guo
Localized surface plasmon resonance (LSPR) of nanostructures and the interfacial charge transfer (CT) of semiconductor materials play essential roles in the study of optical and photoelectronic properties. In this paper, a composite substrate of Ag2S quantum dots (QDs) coated plasmonic Au bowtie nanoantenna (BNA) arrays with a metal–insulator–metal (MIM) configuration was built to study the synergistic effect of LSPR and interfacial CT using surface-enhanced Raman scattering (SERS) in the near-infrared (NIR) region. The Au BNA array structure with a large enhancement of the localized electric field (E-field) strongly enhanced the Raman signal of adsorbed p-aminothiophenol (PATP) probe molecules. Meanwhile, the broad enhanced spectral region was achieved owing to the coupling of LSPR. The as-prepared Au BNA array structure facilitated enhancements of the excitation as well as the emission of Raman signal simultaneously, which was established by finite-difference time-domain simulation. Moreover, Ag2S semiconductor QDs were introduced into the BNA/PATP system to further enhance Raman signals, which benefited from the interfacial CT resonance in the BNA/Ag2S-QDs/PATP system. As a result, the Raman signals of PATP in the BNA/Ag2S-QDs/PATP system were strongly enhanced under 785 nm laser excitation due to the synergistic effect of E-field enhancement and interfacial CT. Furthermore, the SERS polarization dependence effects of the BNA/Ag2S-QDs/PATP system were also investigated. The SERS spectra indicated that the polarization dependence of the substrate increased with decreasing polarization angles (θpola) of excitation from p-polarized (θpola=90°) excitation to s-polarized (θpola=0°) excitation. This study provides a strategy using the synergistic effect of interfacial CT and E-field enhancement for SERS applications and provides a guidance for the development of SERS study on semiconductor QD-based plasmonic substrates, and can be further extended to other material-nanostructure systems for various optoelectronic and sensing applications.
研究领域:
光学
·
光子学
·
材料科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）