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研究了Co2+掺杂TiO2纳米粒子在光信号诱导下产生的超氧阴离子自由基在纳米粒子表面的吸附和解吸特性.当以该纳米粒子为光催化氧化剂进行原位光致化学发光反应时,光诱导产生的超氧阴离子自由基通过扩散穿过纳米粒子表面的双电层到达本体溶液,与溶液中的化学发光试剂进行化学发光反应.由于超氧阴离子自由基在纳米粒子表面的吸附、解吸和双电层效应,使得光化学反应和其后的光生氧化剂的化学发光反应具有时间和空间的分辨特性.将Co2+掺杂TiO2纳米粒子光致化学发光反应的特点与鲁米诺化学发光体系结合,建立了一种原位光致化学发光反应的新方法,并提出了一种基于纳米技术调控化学发光反应的新思路.在最佳反应条件下,该方法对格列本脲响应的线性范围为2.0×10-8～1.0×10-6g·mL-1,检出限为6×10-9g·mL-1.
The adsorption and desorption properties of Co2 + -doped TiO2 nanoparticles induced by light signal on the surface of nanoparticles were studied. When the nanoparticles were used as photocatalytic oxidants for in situ photoluminescence Induction of superoxide anion radicals through the diffusion of nano-particles through the surface of the electric double layer to reach the bulk solution, and chemiluminescence reagents in the chemiluminescence reaction.Solar superoxide anion adsorption on the nanoparticle surface, desorption and Electric double layer effect makes the chemiluminescence reaction of photochemical reaction and subsequent photogenerated oxidant have time and space resolution characteristics.Coupling the characteristics of photoluminescence reaction of Co2 + -doped TiO2 nanoparticles with luminol chemiluminescence system, A new method of in situ chemiluminescence reaction was proposed and a new idea based on nanotechnology was proposed to control the chemiluminescence reaction.The linear range of the response to glyburide under the optimal reaction conditions was 2.0 × 10-8 ~ 1.0 × 10-6g · mL-1, the detection limit was 6 × 10-9g · mL-1.