罗丹明-磷钼酸复合物的合成、表征及应用
首发时间:2013-11-29
摘要:合成了罗丹明6G-磷钼酸(R6G-PMA)和罗丹明B-磷钼酸(RhB-PMA)两种复合纳米微粒,并且用扫描电子显微镜、紫外-可见吸收光谱、荧光光谱、共振光散射(RLS)光谱对复合纳米微粒进行了表征。RhB-PMA复合纳米微粒的平均粒径为343±144 nm。R6G-PMA和RhB-PMA复合纳米微粒具有优异的光学性能,最大吸收波长分别为562 nm和555 nm,其荧光峰分别位于581 nm和580 nm。复合纳米微粒的吸收波长和荧光峰波长都比相应的罗丹明染料发生红移,且表现出强烈的共振光散射增强效应,R6G-PMA和RhB-PMA的最大RLS峰波长分别为581 nm和654 nm。这表明在复合纳米微粒中相邻的罗丹明染料分子之间存在强烈的电子耦合。制备了R6G-PMA修饰玻碳电极,研究了H2O2在R6G-PMA修饰电极上的电化学行为。结果表明该修饰电极对H2O2有着明显的电化学信号,且在H2O2浓度为3.3×10-6 mol/L~5.6 10-5 mol/L的范围内呈线性响应,回归方程为Current/μA= 1.366 + 0.1553C/(10-6 mol/L),相关系数r2为0.9921,检出限(3σ)为2.0×10-8 mol/L。该修饰电极对尿酸和抗坏血酸有较好的抗干扰能力,可以在尿酸和抗坏血酸共存的情况下测定H2O2。
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Synthesis, Characterization and Application of Rhodamine-Phosphomolybdic Acid Hybrids
Abstract:In this paper, rhodamine 6G-phosphomolybdic acid hybrid (R6G-PMA) and rhodamine B-phosphomolybdic acid hybrid (RhB-PMA) were synthesized and were further characterized by scanning electron microscopy, UV-Vis spectroscopy, fluorescence spectroscopy and resonance light scattering (RLS) spectroscopy. The average size of RhB-PMA was about 343±144 nm. The prepared R6G-PMA and RhB-PMA hybrids had good optical properties with maximum absorption of 562nm and 555 nm and fluorescence emission of 581 nm and 580 nm, respectively. Both the absorption and fluorescence emission of R6G-PMA and RhB-PMA show bathochromic shift effect and strong enhancement effect of resonance light scattering with maximum RLS wavelength of 581 nm and 654 nm, respectrively. Then R6G-PMA modified glass carbon electrode was prepared and on which the electrochemical bahavior of hydrogen peroxide was studied. The results indicated that the current of the prepared R6G-PMA modified electrode had a linear relationship with the concentration of hydrogen peroxide from 3.3×10-6 mol/L~5.6 10-5 mol/L. The regression equation was current/μA= 1.366 + 0.1553C/(10-6 mol/L) with correlation coefficient of 0.9921 and a detection limit (3σ) of 2.0×10-8 mol/L. The prepared R6G-PMA modified electrode had good anti-interference ability and could selectively detect hydrogen peroxide in the presence of uric acid and ascorbic acid.
Keywords: Analytical Chemistry Rhodamine, Phosphomolybdic Acid Hydrogen Peroxide Resonance Light Scattering
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