Gold nanorod@nanoparticle seed-SERSnanotags/graphene oxide plasmonic superstructured nanocomposities as an “on-off” SERS aptasensor

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 appro...

Full description

Saved in:
Bibliographic Details
Published inCarbon (New York) Vol. 133; pp. 209 - 217
Main Authors Tao, GangQiang, Wang, Jin
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.07.2018
Elsevier BV
Subjects
Copper
Deoxyribonucleic acid
Dismantling
DNA
Gold
Graphene
Morphology
Nanocomposites
Nanoparticles
Nanorods
Purity
Sensors
Substrates
Online AccessGet full text

Cover

More Information
Summary: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. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2018.03.037