Document Type

Article

Publication Date

10-31-2019

Abstract

Hierarchically nanostructured silicon was produced by regenerative electroless etching (ReEtching) of Si powder made from pulverized anodized porous silicon. This material is characterized by ∼15 nm mesopores, into the walls of which tortuous 2–4 nm pores have been introduced. The walls are sufficiently narrow that they support quantum-confined crystallites that are photoluminescent. With suitable parameters, the ReEtching process also provides control over the emission color of the photoluminescence. Ball milling and hydrosilylation of this powder with undecylenic acid produces nanoparticles with hydrodynamic diameter of ∼220 nm that exhibit robust and bright luminescence that can be excited with either one ultraviolet/visible photon or two near-infrared photons. The long-lived, robust visible photoluminescence of these chemically passivated porous silicon nanoparticles is well-suited for bioimaging and theranostic applications.

Publication Title

ACS Nano

ISSN

1936-0851

Publisher

American Chemical Society

Volume

XXXX

Issue

XXX

First Page

A

Last Page

I

DOI

10.1021/acsnano.9b05740

Comments

Post-print version of article posted on Digital Commons @ WCU

Available for download on Friday, November 06, 2020

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