Sensitive detection of copper ions via ion-responsive fluorescence quenching of engineered porous silicon nanoparticles.

Abstract:

:Heavy metal pollution has been a problem since the advent of modern transportation, which despite efforts to curb emissions, continues to play a critical role in environmental pollution. Copper ions (Cu2+), in particular, are one of the more prevalent metals that have widespread detrimental ramifications. From this perspective, a simple and inexpensive method of detecting Cu2+ at the micromolar level would be highly desirable. In this study, we use porous silicon nanoparticles (NPs), obtained via anodic etching of Si wafers, as a basis for undecylenic acid (UDA)- or acrylic acid (AA)-mediated hydrosilylation. The resulting alkyl-terminated porous silicon nanoparticles (APS NPs) have enhanced fluorescence stability and intensity, and importantly, exhibit [Cu2+]-dependent quenching of fluorescence. After determining various aqueous sensing conditions for Cu2+, we demonstrate the use of APS NPs in two separate applications - a standard well-based paper kit and a portable layer-by-layer stick kit. Collectively, we demonstrate the potential of APS NPs in sensors for the effective detection of Cu2+.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Hwang J,Hwang MP,Choi M,Seo Y,Jo Y,Son J,Hong J,Choi J

doi

10.1038/srep35565

subject

Has Abstract

pub_date

2016-10-18 00:00:00

pages

35565

issn

2045-2322

pii

srep35565

journal_volume

6

pub_type

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