Luminescence nanothermometry with alkyl-capped silicon nanoparticles dispersed in nonpolar liquids
1 Université de Lyon, CNRS, UMR 5270, INSA-Lyon, INL, Villeurbanne 69621, France
2 Chemistry Faculty, Kiev National Taras Shevchenko University, Kiev 01601, Ukraine
3 Université de Lyon, CNRS, UMR 5306, Université Claude Bernard Lyon1, ILM, Villeurbanne 69622, France
4 Université de Lyon, CNRS, UMR 5270, EC-Lyon, INL, Ecully 69134, France
5 Université de Lyon, CNRS, UMR5259, INSA-Lyon, LaMCoS, Villeurbanne 69621, France
Nanoscale Research Letters 2014, 9:94 doi:10.1186/1556-276X-9-94Published: 24 February 2014
Silicon nanoparticles (Si NPs) with a diameter size ranging from 4 to 8 nm were successfully fabricated. They exhibit a visible photoluminescence (PL) due to the quantum confinement effect. Chemical functionalization of these Si NPs with alkyl groups allowed to homogeneously disperse them in nonpolar liquids (NPLs). In comparison to most of literature results for Si NPs, an important PL peak position variation with temperature (almost 1 meV/K) was obtained from 303 to 390 K. The influence of the liquid viscosity on the peak positions is also presented. These variations are discussed considering energy transfer between nanoparticles. The high PL thermal sensitivity of the alkyl-capped Si NPs paves the way for their future application as nanothermometers.