In situ regulation nanoarchitecture of Au nanoparticles/reduced graphene oxide colloid for sensitive and selective SERS detection of lead ions.
In situ regulation nanoarchitecture of Au nanoparticles/reduced graphene oxide colloid for sensitive and selective SERS detection of lead ions.
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DOI：
10.1016/j.jcis.2015.11.073
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发表时间：
2016-03
影响因子：
9.9
通讯作者：
Longyun Zhao;W. Gu;Cuiling Zhang;Xinhao Shi;Y. Xian
中科院分区：
文献类型：
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作者：
Longyun Zhao;W. Gu;Cuiling Zhang;Xinhao Shi;Y. Xian
通过在氧化石墨烯（GO）纳米片上还原HAuCl 4，在还原氧化石墨烯（rGO）上生长金纳米颗粒（AuNPs），制备了Au纳米颗粒（AuNPs）/还原氧化石墨烯（rGO）胶体。通过原位Pb 2+强化浸金反应，可调控胶体的纳米结构，使其成为一种灵活的Pb 2+表面增强拉曼散射（Sers）检测平台。在添加Pb 2+时，石墨烯的拉曼信号由于“热点”的量的减少而经历显著下降，所述“热点”源自于在硫代硫酸盐（S2 O32-）存在下Pb 2+加速的石墨烯表面上的AuNP的溶解。基于Sers信号通过原位调节胶体纳米结构的变化，发展了一种灵敏、选择性的Pb 2+检测策略，其线性范围为5 nM ~ 4 μM，检测限为1 nM。将该方法应用于水样中Pb 2+的测定，结果令人满意。
In this work, the colloid of Au nanoparticles (AuNPs)/reduced graphene oxide (rGO) was synthesized by growth AuNPs on rGO via the reduction of HAuCl4on graphene oxide (GO) nanosheets. The nanoarchitecture of the colloid could be controllably regulated through in-situ Pb2+-enhanced gold leaching reaction, which made the colloid be a flexible surface-enhanced Raman scattering (SERS) platform for Pb2+detection. Upon the addition of Pb2+, the Raman signal of graphene underwent significant descent due to the decrease of the amount of the “hot spots”, which was originated from Pb2+-accelerated dissolution of AuNPs on the graphene surface in the present of thiosulfate (S2O32−). Based on the change of SERS signal throughin situregulation the nanoarchitecture of the colloid, a sensitive and selective strategy for Pb2+measurement was developed with a linear range from 5 nM to 4 μM as well as a low detection limit of 1 nM. Furthermore, the SERS-based method was applied for the determination of Pb2+in water samples with satisfactory results.