Raman excitation profiles of hybrid systems constituted by single-layer graphene and free base phthalocyanine: Manifestations of two mechanisms of graphene-enhanced Raman scattering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F17%3A00482928" target="_blank" >RIV/61388955:_____/17:00482928 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389013:_____/17:00482928 RIV/00216208:11310/17:10368330 RIV/00216208:11320/17:10368330

Výsledek na webu

<a href="http://dx.doi.org/10.1002/jrs.5206" target="_blank" >http://dx.doi.org/10.1002/jrs.5206</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/jrs.5206" target="_blank" >10.1002/jrs.5206</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Raman excitation profiles of hybrid systems constituted by single-layer graphene and free base phthalocyanine: Manifestations of two mechanisms of graphene-enhanced Raman scattering

Popis výsledku v původním jazyce

The ability of single-layer graphene (SLG) to enhance Raman scattering of planar aromatic molecules denoted graphene-enhanced Raman scattering (GERS) is currently the subject of focused interest. We report on manifestations of two mechanisms of GERS in Raman spectra of glass/SLG/free base phthalocyanine (H2Pc) monolayer (ML) hybrid systems: (i) photoinduced charge transfer from SLG Fermi level to LUMO of H2Pc excited at onset of the near IR region, and (ii) modification of resonance Raman scattering of H2Pc in the visible region by SLG-H2Pc interaction resulting into delocalization of the electronic transition over the benzene rings of H2Pc. Glass/SLG/H2Pc hybrid systems with either a bilayer or a monolayer of H2Pc molecules and a graphite/H2Pc (ML) reference system were prepared by a spectrally controlled adsorption-desorption of H2Pc from solution, followed by Raman mapping of samples at excitation wavelengths in the 532-830 nm range, construction of excitation profiles for H2Pc Raman bands of the glass/SLG/H2Pc samples and determination of GERS enhancement factors for the glass/SLG/H2Pc (ML) sample versus the graphite/H2Pc (ML) reference sample (3-24 at 633 nm and 3-19 at 647 nm excitations). Selectivity of the excitation profiles and of the GERS enhancement factors with respect to localization of the vibrational modes within the H2Pc molecule demonstrates involvement of a different resonant electronic transition in each of the two mechanisms of GERS. Copyright (c) 2017 John Wiley & Sons, Ltd.

Název v anglickém jazyce

Raman excitation profiles of hybrid systems constituted by single-layer graphene and free base phthalocyanine: Manifestations of two mechanisms of graphene-enhanced Raman scattering

Popis výsledku anglicky

The ability of single-layer graphene (SLG) to enhance Raman scattering of planar aromatic molecules denoted graphene-enhanced Raman scattering (GERS) is currently the subject of focused interest. We report on manifestations of two mechanisms of GERS in Raman spectra of glass/SLG/free base phthalocyanine (H2Pc) monolayer (ML) hybrid systems: (i) photoinduced charge transfer from SLG Fermi level to LUMO of H2Pc excited at onset of the near IR region, and (ii) modification of resonance Raman scattering of H2Pc in the visible region by SLG-H2Pc interaction resulting into delocalization of the electronic transition over the benzene rings of H2Pc. Glass/SLG/H2Pc hybrid systems with either a bilayer or a monolayer of H2Pc molecules and a graphite/H2Pc (ML) reference system were prepared by a spectrally controlled adsorption-desorption of H2Pc from solution, followed by Raman mapping of samples at excitation wavelengths in the 532-830 nm range, construction of excitation profiles for H2Pc Raman bands of the glass/SLG/H2Pc samples and determination of GERS enhancement factors for the glass/SLG/H2Pc (ML) sample versus the graphite/H2Pc (ML) reference sample (3-24 at 633 nm and 3-19 at 647 nm excitations). Selectivity of the excitation profiles and of the GERS enhancement factors with respect to localization of the vibrational modes within the H2Pc molecule demonstrates involvement of a different resonant electronic transition in each of the two mechanisms of GERS. Copyright (c) 2017 John Wiley & Sons, Ltd.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA15-01953S" target="_blank" >GA15-01953S: Nanokompozitní systémy plasmonických/magnetických nanočástic - grafenu - aromatických molekul pro zesílené Ramanské procesy</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Raman Spectroscopy

ISSN

0377-0486

e-ISSN

—

Svazek periodika

48

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

1270-1281

Kód UT WoS článku

000413680400003

EID výsledku v databázi Scopus

2-s2.0-85026286855