NANOSENSING - Semiconductor nanocomposite thin films composed of noble metal nanoparticles dispersed in reactive metal-oxide matrixes for LSPR gas sensing applications

Referência:

PTDC/FIS-NAN/1154/2014

POCI-01-0145-FEDER-016902

PI: Filipe Vaz

 

Resumo/Summary:

The NANOSENSING project aims to develop low-cost gas sensors, based on metal-oxide semiconductor (MOS) structures, containing several types of noble metal (NM) nanoparticles (NPs), with near-single molecule sensitivity with large relevance for several industrial sectors. In scientific terms, NANOSENSING integrates experimental and theoretical approaches in Physics, while addressing a specific application: gas sensing. The main background consists on the use of the so-called Localized Surface Plasmon Resonance (LSPR), which are collective electron charge oscillations in metallic nanoparticles that occur upon excitation by light. The phenomenon enhances the near-field amplitude at the resonance wavelength and is highly localized, decaying rapidly away from the nanoparticle/dielectric interface into the background.

The mechanism of detection is based on the modification of the local refractive index of chemically reactive dielectric matrices by the adsorbing molecules. These changes are expected to affect the LSPR of noble metal clusters dispersed in the dielectric matrix, which can be used to measure low concentrations of gas

molecules. The light intensity enhancement and the subwavelength spatial resolution, limited only by the size of the nanoparticles and therefore tunable, confer to these systems the potential for near-single molecule detection.

Palavras chave:

Surface Plasmon Resonance

Gas sensor

Change of Optical Characetristics

Cluster Gun

Parceiros:

  • UNIVERSIDADE DO MINHO
  • INSTITUTO PEDRO NUNES
  • NOVA.ID.FCT

Orçamento Global: 186 408,00€

Orçamento UMinho: 85 584,00 €

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Apoio Financeiro UM

FEDER: 72 746,40€

OE: 12 837,60€

Data início: 01-07-2016

Data Fim: 30-06-2019

 

Financiamento:

FEDER, OE

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