【摘要】 在pH 6.2的Na2HPO4-柠檬酸缓冲溶液、水浴60℃条件下,纳米银粒子催化水合肼(N2H4)还原氯金酸(HAuCl4),Au3+被还原成单质金并吸附在金纳米表面,在370nm处有一个较强的共振瑞利散射(RRS)峰。随着N2H4浓度的增大,生成的单质金越多,金纳米的粒径也逐渐增大,使得体系370nm处的共振瑞利散射峰线性强度增大,从而构建纳米银催化RRS分析平台并用于检测N2H4。在选定条件下,N2H4的浓度在0.012 5~3.5μmol/L范围内与共振散射峰强度增加值ΔI呈现良好线性关系,线性方程为ΔIRS=1 297.8C+228.78,检出限为0.006μmol/L N2H4,该法测定了水样中的N2H4,结果令人满意。更多还原

【Abstract】 In pH 6.2 Na2HPO4-citric acid buffer solution,water bath 60 ℃,Au3+from HAuCl4 was reduced to Au nanoflowers(AuNF)by hydrazine hydrate(N2H4)that catalyzed by silver nanoparticles(AgNPs)and growing around the AgNPs surface.Thus,the special AuNFs exhibited a strong resonance Rayleigh scattering(RRS)peak at 370 nm.With increase of N2H4 concentration,AuNFs gradually increased and formed the larger size AuNFs,and the RRS intensity was linearly increased.So,a simple and sensitive nanosilver catalytic reaction RRS analysis platform was fabricated which can be utilized to detect trace N2H4.Under the selected conditions,a linear relation between the increased RRS intensity(ΔI370nm)and N2H4 concentration was found in the range of 0.012 5~3.5μmol/L,with a regression equation ofΔIRS=1 297.8C+228.78,and detection limit of 0.006μmol/L.The method was used for the detection of N2H4 in water sample with satisfactory results.更多还原