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  New Mechanism for Long Photo-Induced Enhanced Raman Spectroscopy in Au Nanoparticles Embedded in TiO2

Brognara, A., Bricci, B. R., William, L., Brinza, O., Konstantakopoulou, M., Li Bassi, A., et al. (2022). New Mechanism for Long Photo-Induced Enhanced Raman Spectroscopy in Au Nanoparticles Embedded in TiO2. Small; This article also appears in: Hot Topic: Surfaces and Interfaces; Rising Stars, 18(25): 2201088. doi:10.1002/smll.202201088.

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Small - 2022 - Brognara - New Mechanism for Long Photo‐Induced Enhanced Raman Spectroscopy in Au Nanoparticles Embedded in.pdf (Publisher version), 2MB
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Small - 2022 - Brognara - New Mechanism for Long Photo‐Induced Enhanced Raman Spectroscopy in Au Nanoparticles Embedded in.pdf
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Open Access
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application/pdf / [MD5]
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Copyright Date:
2022
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Wiley-VCH GmbH
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 Creators:
Brognara, Andrea1, 2, Author           
Bricci, Beatrice R.1, Author
William, Ludovic3, Author
Brinza, Ovidiu3, Author
Konstantakopoulou, Maria3, Author
Li Bassi, Andrea4, Author           
Ghidelli, Matteo1, 2, 5, Author           
Lidgi-Guigui, Nathalie3, Author
Affiliations:
1Micro- and Nanostructured Materials Laboratory, Department of Energy, Politecnico di Milano, via Ponzio 34/3, I-20133, Milano, Italy, ou_persistent22              
2Nano-/ Micromechanics of Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863401              
3Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430 France, ou_persistent22              
4Dipartimento di Energia, Laboratorio Materiali Micro e Nanostrutturati Politecnico di Milano, Italy, ou_persistent22              
5Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, 93430 Villetaneuse, France, ou_persistent22              

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Free keywords: cathodoluminescence, nanoparticles, photo-induced charge separation, photo-induced enhanced Raman spectroscopy, surface enhanced Raman spectroscopy, TiO2
 Abstract: Abstract The photo-induced enhanced Raman spectroscopy (PIERS) effect is a phenomenon taking place when plasmonic nanoparticles deposited on a semiconductor are illuminated by UV light prior to Raman measurement. Results from the literature show that the PIERS effect lasts for about an hour. The proposed mechanism for this effect is the creation of oxygen vacancies in the semiconductor that would create a path for charge transfer between the analyte and the nanoparticles. However, this hypothesis has never been confirmed experimentally. Furthermore, the tested structure of the PIERS substrate has always been composed of plasmonic nanoparticles deposited on top of the semiconductor. Here, gold nanoparticles co-deposited with porous TiO2 are used as a PIERS substrate. The deposition process confers the nanoparticles a unique position half buried in the nanoporous semiconductor. The resulting PIERS intensity is among the highest measured until now but most importantly the duration of the effect is significantly longer (at least 8 days). Cathodoluminescence measurements on these samples show that two distinct mechanisms are at stake for co-deposited and drop-casted gold nanoparticles. The oxygen vacancies hypothesis tends to be confirmed for the latter, but the narrowing of the depletion zone explains the long PIERS effect.

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Language(s): eng - English
 Dates: 2022-05-262022-06-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/smll.202201088
 Degree: -

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Title: Small; This article also appears in: Hot Topic: Surfaces and Interfaces; Rising Stars
  Other : Small
Source Genre: Journal
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Publ. Info: Weinheim, Germany : Wiley-VCH
Pages: 10 Volume / Issue: 18 (25) Sequence Number: 2201088 Start / End Page: - Identifier: ISSN: 1613-6810
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000017440_1