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Investigation of Upconversion Luminescence Attenuation in Aqueous Solutions Under 980 nm and 808 nm Irradiation

Journal of Analysis and Testing 2023年第4期7卷 377-383页

作者： Tianli Zhai Yanxin Zhang Daoming Guan Lu Yang Wenrui Zhang Yunxiang Zhang Qian Liu Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan UniversityShanghai 200438China

Lanthanide ions-doped upconversion nanoparticles(UCNPs)have shown great potential in various biomedical ***,the upconversion luminescence(UCL)intensity of UCNPs in water environment tends to be *** quenching is typically attributed to non-radiative relaxation of the excited *** this study,we designed a core-shellshell-shell NaYb_(0.88)Er_(0.12)F_(4)@NaY_(0.9)b_(0.1)F_(4)@NaY_(0.6)Nd_(0.3)Yb_(0.1)F_(4)@NaYF_(4)UCNPs that could be excited by both 980 nm and 808 nm laser,due to the doping of Nd^(3+)and Yb^(3+)*** research not only utilized bulk spectral measurement but also employed single-particle level microscopic imaging to comprehensively investigate the impact of water molecules on UCL under 980 nm and 808 nm ***,our findings indicate that the absorption of water molecules has a significant effect on the UCL decay of UCNPs in aqueous solutions when excited by a 980 nm *** work offers a new perspective on the luminescence behavior of UCNPs in aquatic environments and provides valuable insights for their application and development in biomedicine.

关键词： UCNPs Upconversion luminescence Absorption of water molecules single-particle imaging

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Fast Surface Restructuring within the Gap of Au Nanocube Dimer for the Enhancement of Catalytic Efficiency

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CCS Chemistry 2022年第3期4卷 1074-1086页

作者： Xiao Wang Zhongju Ye Jianhao Hua Lin Wei Shen Lin Lehui Xiao State Key Laboratory of Medicinal Chemical Biology Tianjin Key Laboratory of Biosensing and Molecular RecognitionCollege of ChemistryNankai UniversityTianjin 300071 College of Chemistry and Chemical Engineering Hunan Normal UniversityChangsha 410081

Identification of the catalytic dynamics and plasmonic effects plays a critical role in the design of heterogeneous ***,the knowledge of plasmonic effect on catalytic dynamics remains limited at the single-particle *** the non-fluorescent amplex red to fluorescent resorufin as a model reaction,significant enhancement in catalytic efficiency from the coupled Au nanocube dimer(AuCD)was clearly revealed with the single-molecule fluorescence *** exhibits noticeably higher catalytic efficiency than the monomer,which is attributed to the spontaneous dynamic surface *** resolved dynamics suggest that the active catalytic sites essentially originate from the plasmonic nanogap where an electromagnetic(EM)hot spot *** enhanced EM field accelerates the generation of hot carriers and promotes the spontaneous surface restructuring by enhancing the lattice vibrations,which ultimately improves the catalytic *** microscopic views provide new insights into the effect of EM fields on surface restructuring dynamics of nanocatalysts.

关键词： dark-field plasmonic nanoparticles Raman spectroscopy surface dynamic restructuring single-particle imaging

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