纳米银催化共振瑞利散射光谱检测痕量肼

An Analytical Platform of Nanosilver SPR Rayleigh Scattering and Its Application to Detect N_2H_4

在pH6．2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0．0125～3．5μmol／L范围内与共振散射峰强度增加值△I呈现良好线性关系，线性方程为△IRS=1297．8C十228．78，检出限为0．006μmol／LN2H4，该法测定了水样中的N2H4，结果令人满意。

In pH 6.2 Na2HPO4-citric acid buffer solution, water bath 60 ℃, AC＋ from HAuC14 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 （AI370nm）and N2H4 concentration was found in the range of 0.012 5=-3.5 μmol/L, with a regression equation of AIRS = 1 297.8C ＋228.78, and detection limit of 0.006/μmol/L. The method was used for the detection of N2H4 in water sample with satisfactory results.