Journal
ACS NANO
Volume 13, Issue 11, Pages 13056-13064Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b05740
Keywords
porous silicon; two-photon fluorescence; photoluminescence; etching; hierarchical nanostructure; nanoparticle
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Funding
- National Science Foundation [1825331]
- Academy of Finland [277190]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1825331] Funding Source: National Science Foundation
- Academy of Finland (AKA) [277190, 277190] Funding Source: Academy of Finland (AKA)
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Hierarchically nanostructured silicon was produced by regenerative electroless etching (ReEtching) of Si powder made from pulverized anodized porous silicon. This material is characterized by similar to 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 similar to 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.
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