Metal-free highly luminescent silica nanoparticles

Langmuir : the ACS Journal of Surfaces and Colloids
Carlos D S BritesLuís D Carlos

Abstract

Stable, cost-effective, brightly luminescent, and metal-free organosilica nanoparticles (NPs) were prepared using the Stöber method without any thermal treatment above 318 K. The white-light photoluminescence results from a convolution of the emission originated in the NH(2) groups of the organosilane and oxygen defects in the silica network. The time-resolved emission spectra are red-shifted, relative to those acquired in the steady-state regime, pointing out that the NPs emission is governed by donor-acceptor (D-A) recombination mechanisms. Moreover, the increase of the corresponding lifetime values with the monitored wavelength further supports that the emission is governed by a recombination mechanism typical of a D-A pair attributed to an exceptionally broad inhomogeneous distribution of the emitting centers peculiar to silica-based NPs. These NPs exhibit the highest emission quantum yield value (0.15 ± 0.02) reported so far for organosilica biolabels without activator metals. Moreover, the emission spectra and the quantum yield values are quite stable over time showing no significant aging effects after exposure to the ambient environment for more than 1 year, stressing the potential of these NPs as metal-free biolabels.

References

May 29, 2007·The Journal of Physical Chemistry. B·John N CliffordEdwin K L Yeow
Jan 26, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Lin WangWeihong Tan
Jul 8, 2008·Angewandte Chemie·Jan VogelsangPhilip Tinnefeld
Aug 13, 2008·Nanomedicine·Padmavathy TallurySwadeshmukul Santra
Jan 14, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Subhasree Banerjee, Anindya Datta
Jul 1, 2010·Advanced Materials·Maria BardosovaRichard H Tredgold
Sep 21, 2010·Journal of Colloid and Interface Science·Deyan KongJun Lin
Feb 2, 2009·Advanced Materials·Luís D CarlosSidney J L Ribeiro
Mar 11, 2011·ACS Applied Materials & Interfaces·Ying LinXiqun Jiang
Oct 11, 2011·ACS Nano·Cedric BouziguesAntigoni Alexandrou

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Citations

Sep 11, 2014·Physical Chemistry Chemical Physics : PCCP·Luisa SpallinoFranco Mario Gelardi
Feb 21, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Sourov ChandraFrançoise M Winnik

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