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Issue 29, 2016

Speciation of nanoscale objects by nanoparticle imprinted matrices

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Abstract

The toxicity of nanoparticles is not only a function of the constituting material but depends largely on their size, shape and stabilizing shell. Hence, the speciation of nanoscale objects, namely, their detection and separation based on the different species, similarly to heavy metals, is of outmost importance. Here we demonstrate the speciation of gold nanoparticles (AuNPs) and their electrochemical detection using the concept of “nanoparticles imprinted matrices” (NAIM). Negatively charged AuNPs are adsorbed as templates on a conducting surface previously modified with polyethylenimine (PEI). The selective matrix is formed by the adsorption of either oleic acid (OA) or poly(acrylic acid) (PAA) on the non-occupied areas. The AuNPs are removed by electrooxidation to form complementary voids. These voids are able to recognize the AuNPs selectively based on their size. Furthermore, the selectivity could be improved by adsorbing an additional layer of 1-hexadecylamine, which deepened the voids. Interestingly, silver nanoparticles (AgNPs) were also recognized if their size matched those of the template AuNPs. The steps in assembling the NAIMs and the reuptake of the nanoparticles were characterized carefully. The prospects for the analytical use of NAIMs, which are simple, of small dimension, cost-efficient and portable, are in the sensing and separation of nanoobjects.

Graphical abstract: Speciation of nanoscale objects by nanoparticle imprinted matrices

Supplementary files

Article information


Submitted
06 Feb 2016
Accepted
18 Feb 2016
First published
22 Feb 2016

This article is Open Access

Nanoscale, 2016,8, 13934-13943
Article type
Paper

Speciation of nanoscale objects by nanoparticle imprinted matrices

M. Hitrik, Y. Pisman, G. Wittstock and D. Mandler, Nanoscale, 2016, 8, 13934 DOI: 10.1039/C6NR01106C

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