title: 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+.
authors.affiliation: School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Jangsun
authors.initials: J
authors.lastname: Hwang
authors.affiliation: Department of Bioengineering, Swanson School of Engineering, University of Pittsburgh, Pittsburgh, PA 15261 USA.
authors.forename: Mintai P
authors.initials: MP
authors.lastname: Hwang
authors.affiliation: School of Chemical Engineering &Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Moonhyun
authors.initials: M
authors.lastname: Choi
authors.affiliation: School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Youngmin
authors.initials: Y
authors.lastname: Seo
authors.affiliation: School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Yeonho
authors.initials: Y
authors.lastname: Jo
authors.affiliation: School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Jaewoo
authors.initials: J
authors.lastname: Son
authors.affiliation: School of Chemical Engineering &Materials Science, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Jinkee
authors.initials: J
authors.lastname: Hong
authors.affiliation: School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.
authors.forename: Jonghoon
authors.initials: J
authors.lastname: Choi