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Hu, Jinlian,Lee, Woong,Cai, Weiping,Tong, Liuniu,Zeng, Haibo IOP Pub 2007 Nanotechnology Vol.18 No.18
<P>Evolution of the various optical spectra of Ag nanoparticles dispersed in mesoporous SiO<SUB>2</SUB> after heating alternately in H<SUB>2</SUB> and air atmospheres has been investigated. It has been observed that, in accordance with alternate heat treatment in H<SUB>2</SUB> and air, surface plasmon resonance (SPR) absorption of the Ag/mesoporous SiO<SUB>2</SUB> nanostructure alternately appeared and disappeared and its Raman scattering spectra reversibly increased and decreased. In contrast, its photoluminescence (PL) spectra alternately disappeared and appeared, whereas the infrared (IR) spectra did not change. Such novel optical sensitivities of silver nanoparticles are discussed on the basis of the changes in chemical states of silver induced by the interaction of silver nanoparticles with the atmospheres and the hosting medium. It is suggested that the chemical state of silver in mesoporous SiO<SUB>2</SUB> changes reversibly between Ag and the Ag<SUP>+</SUP> ion by the redox process. </P>
Fast fluorescent blood sugar sensing using phenylboronic acid functionalized N, S-doped carbon dots
Wang Xiaoge,Fan Xiangze,Zhang Bowen,Zhan Mengke,Zhu Jinhua,Hu Weiping,Liu Xiuhua 한국탄소학회 2024 Carbon Letters Vol.34 No.5
A phenylboric acid functionalized carbon dot (2-FPBA-CD) for rapid fluorescent sensing of glucose in blood was synthesized by simply mixing N, S-doped carbon dots (CDs) with phenylboric acid at room temperature. At pH 7.4, the response of 2-FPBA-CD to glucose could reach equilibrium in a very short time (10 min), with a wide responsive linear range of 19.70 µM to 2.54 mM, which can be applied to the detection of glucose in serum. The mechanism studies showed that the layered carbon film of 2-FPBA-CD aggregated after adding glucose, thereby leading to the fluorescence quenching of 2-FPBA-CD.