Issue 23, 2016
From the journal:

Journal of Materials Chemistry B

Protein-aided formation of triangular silver nanoprisms with enhanced SERS performance†

Xi Geng,a   Weinan Leng,bcd   Nathan A. Carter,a   Peter J. Vikesland ORCID logo bcd  and  Tijana Z. Grove*a  

* Corresponding authors

a Department of Chemistry, Virginia Polytechnic Institute and State University, Hahn Hall South, Blacksburg, VA 24060, USA
E-mail: tijana.grove@vt.edu
Tel: +1 540-231-7011

b Department of Civil and Environmental Engineering, Virginia Tech, Durham Hall, Blacksburg, VA 24061, USA

c Virginia Tech Institute of Critical Technology and Applied Science (ICTAS) Sustainable Nanotechnology Center (VTSuN), Virginia Tech, Kelly Hall, Blacksburg, VA 24061, USA

d Center for the Environmental Implications of Nanotechnology (CEINT), Duke University, Durham, NC 27708, USA

Abstract

In this work, we present a modified seed-mediated synthetic strategy for the growth of silver nanoprisms with low shape polydispersity, narrow size distribution and tailored plasmonic absorbance. During the seed nucleation step, consensus sequence tetratricopeptide repeat (CTPR) proteins are utilized as potent stabilizers to facilitate the formation of planar-twinned Ag seeds. Ag nanoprisms were produced in high yield in a growth solution containing ascorbic acid and CTPR-stabilized Ag seeds. From the time-course UV-Vis and transmission electron microscopy (TEM) studies, we postulate that the growth mechanism is the combination of facet selective lateral growth and thermodynamically driven Ostwald ripening. The resultant Ag nanotriangles (NTs) exhibit excellent surface enhanced Raman spectroscopy (SERS) performance. The enhancement factor (EF) measured for the 4-mercapto benzoic acid (4-MBA) reporter is estimated to be 3.37 × 105 in solution and 2.8 × 106 for the SERS substrate.

Graphical abstract: Protein-aided formation of triangular silver nanoprisms with enhanced SERS performance

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Article information

DOI
https://doi.org/10.1039/C6TB00844E
Article type
Paper
Submitted
05 Apr 2016
Accepted
10 May 2016
First published
10 May 2016
This article is Open Access
Creative Commons BY-NC license

J. Mater. Chem. B, 2016,4, 4182-4190

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Protein-aided formation of triangular silver nanoprisms with enhanced SERS performance

X. Geng, W. Leng, N. A. Carter, P. J. Vikesland and T. Z. Grove, J. Mater. Chem. B, 2016, 4, 4182 DOI: 10.1039/C6TB00844E

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