Light emission of gold nanoparticles induced by the reaction of bis(2,4,6-trichlorophenyl) oxalate and hydrogen peroxide
Light emission of gold nanoparticles induced by the reaction of bis(2,4,6-trichlorophenyl) oxalate and hydrogen peroxide
复制标题
双(2,4,6-三氯苯基)草酸酯与过氧化氢反应诱导金纳米粒子发光
DOI：
10.1021/ac050882q
复制
发表时间：
2005-10-01
影响因子：
7.4
通讯作者：
Wu, YL
中科院分区：
文献类型：
--
作者：
Cui, H;Zhang, ZF;Wu, YL
在含有草酸二(2，4，6-三氯苯基)酯和过氧化氢的溶液中，直径为2.6~6.0 nm的金粒子在415 nm附近发光。结果表明，相同粒径的金纳米粒子的光强度与保护剂无关，直径为5.0和6.0 nm的金纳米粒子的光强度比直径2.6和2.8 nm的金纳米粒子强，并且光强度随金纳米粒子浓度的增加而线性增加。金纳米粒子被鉴定为发射物种，并用6.0 nm的金纳米粒子测得量子产率为(2.8+/-0.3)×10(-5)。光发射包括一系列步骤：双(2，4，6-三氯苯基)草酸盐与过氧化氢的氧化反应，生成能量丰富的中间体1，2-二氧杂二酮，能量从该中间体转移到金纳米粒子，以及所形成的激发态金纳米粒子的辐射弛豫。由于金纳米粒子具有良好的生物相容性和相对较高的稳定性，所观察到的发光有望在生物分析领域得到应用。
Light emission at similar to 415 nm was observed for gold particles with diameters of 2.6-6.0 nm dispersed in a solution containing bis(2,4,6-trichlorophenyl) oxalate and hydrogen peroxide. It was found that the light intensity was independent of the protecting reagents of the gold nanoparticles with similar size, the light intensity with gold nanoparticles of 5.0 and 6.0 nm in diameter was stronger than that with gold nanoparticles of 2.6 and 2.8 nm in diameter, and the light intensity increased linearly with the concentration of the gold nanoparticles using 6.0-nm gold nanoparticles. The gold nanoparticles were identified as emitting species, and the quantum yield was determined to be (2.8 +/- 0.3) x 10(-5) using 6.0-nm gold nanoparticles. The light emission is suggested to involve a sequence of steps: the oxidation reaction of bis(2,4,6-trichlorophenyl) oxalate with hydrogen peroxide yielding an energy-rich intermediate 1,2-dioxetanedione, the energy transfer from this intermediate to gold nanoparticles, and the radiative relaxation of the as-formed exited-state gold nanoparticles. The observed luminescence is expected to find applications in the field of bioanalysis owing to the excellent biocompatibility and relatively high stability of gold nanoparticles.