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Gold nanorod@nanoparticle seed-SERSnanotags/graphene oxide plasmonic superstructured nanocomposities as an “on-off” SERS aptasensor
Carbon ( IF 10.9 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.carbon.2018.03.037
GangQiang Tao , Jin Wang

Abstract In order to prepare gold nanorods (AuNRs) with high purity and density on graphene oxide (GO), both two-step strategy of presythesis-postassembly and one-step strategy of in-situ growth have been explored, respectively. Observations of morphology and plasmonic bands reveal that both of the two approaches can yield AuNRs with high purity on GO; however, the former can generate more uniform-sized AuNRs on GO in contrast with the latter. Moreover, the AuNRs/GO and gold nanoparticle seed-SERSnanotags can be assembled to fabricate a large-scaled superstructured plasmonic nanocomposities (AuNR@AuNPS-SERSnanotags/GO) through DNAzyme-DNA substrate prehybridization and in-situ hybridization, respectively, and disassembled via copper ions aided-DNAzyme-DNA substrate cleavage. As a result, an “on-off” aptasensor of DNA-AuNR@AuNPS-SERSnanotags/GO can be utilized as an ultrasensitive SERS substrate for detection of copper ions.

中文翻译:

金纳米棒@纳米粒子种子-SERSnanotags/氧化石墨烯等离子体超结构纳米复合材料作为“开关”SERS适体传感器

摘要 为了在氧化石墨烯(GO)上制备高纯度和高密度的金纳米棒(AuNRs),分别探索了预组装-后组装两步法和原位生长一步法。形态和等离子体带的观察表明,这两种方法都可以在 GO 上产生高纯度的 AuNR;然而,与后者相比,前者可以在 GO 上生成更均匀大小的 AuNR。此外,AuNRs/GO 和金纳米粒子种子-SERSnanotags 可以分别通过 DNAzyme-DNA 底物预杂交和原位杂交组装以制造大规模超结构等离子体纳米复合材料(AuNR@AuNPS-SERSnanotags/GO),并通过铜离子辅助-DNAzyme-DNA 底物裂解。因此,
更新日期:2018-07-01
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