Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System

The effect of derivatization and temperature on the photoluminescence of 1–2 nm size silicon particles of different origin is investigated in an attempt to understand the effect of surface on the particles’ photoluminescence. To this purpose, silicon nanoparticles were synthesized by electrochemical...

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Autores principales: Romero, Juan José, Llansola-Portolés, Manuel J., Dell'Arciprete, María Laura, Rodríguez, Hernán B., Moore, Ana L., González, Mónica Cristina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Química
surface states
thermal quenching
Si/SiO2
interface
optical properties
surface chemistry
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/170194
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-170194
record_format dspace
spelling I19-R120-10915-1701942024-09-14T04:08:39Z http://sedici.unlp.edu.ar/handle/10915/170194 Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System Romero, Juan José Llansola-Portolés, Manuel J. Dell'Arciprete, María Laura Rodríguez, Hernán B. Moore, Ana L. González, Mónica Cristina 2013 2024-09-13T18:36:20Z en Química surface states thermal quenching Si/SiO2 interface optical properties surface chemistry The effect of derivatization and temperature on the photoluminescence of 1–2 nm size silicon particles of different origin is investigated in an attempt to understand the effect of surface on the particles’ photoluminescence. To this purpose, silicon nanoparticles were synthesized by electrochemical (top-down) and wet chemical (bottom-up) procedures. Further derivatization by silylation or sylanization yielded particles with ≡Si—C≡, ≡Si—O—Si≡, and ≡Si—O—C≡ groups at the interface. A detailed analysis of the corresponding excitation–emission matrices strongly indicates that different surface atomic arrangements contribute to the energy gap. In particular, particles with ≡Si—O—Si≡ groups at the interface show photoluminescence independent of the crystalline structure and on their further surface derivatization with different organic molecules. The lifetime and spectrum shape of all synthesized particles are invariable to changes in temperature in the range 270–330 K despite a significant reduction in the photoluminescence intensity being observed with increasing temperature; such behavior supports a thermal equilibrium between dark and bright conformations of the particles. The observed results are of importance for optimizing the use of silicon nanoparticles as optical sensors and therapeutic agents in biological systems. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 3488–3498
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
surface states
thermal quenching
Si/SiO2
interface
optical properties
surface chemistry
spellingShingle Química
surface states
thermal quenching
Si/SiO2
interface
optical properties
surface chemistry
Romero, Juan José
Llansola-Portolés, Manuel J.
Dell'Arciprete, María Laura
Rodríguez, Hernán B.
Moore, Ana L.
González, Mónica Cristina
Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
topic_facet Química
surface states
thermal quenching
Si/SiO2
interface
optical properties
surface chemistry
description The effect of derivatization and temperature on the photoluminescence of 1–2 nm size silicon particles of different origin is investigated in an attempt to understand the effect of surface on the particles’ photoluminescence. To this purpose, silicon nanoparticles were synthesized by electrochemical (top-down) and wet chemical (bottom-up) procedures. Further derivatization by silylation or sylanization yielded particles with ≡Si—C≡, ≡Si—O—Si≡, and ≡Si—O—C≡ groups at the interface. A detailed analysis of the corresponding excitation–emission matrices strongly indicates that different surface atomic arrangements contribute to the energy gap. In particular, particles with ≡Si—O—Si≡ groups at the interface show photoluminescence independent of the crystalline structure and on their further surface derivatization with different organic molecules. The lifetime and spectrum shape of all synthesized particles are invariable to changes in temperature in the range 270–330 K despite a significant reduction in the photoluminescence intensity being observed with increasing temperature; such behavior supports a thermal equilibrium between dark and bright conformations of the particles. The observed results are of importance for optimizing the use of silicon nanoparticles as optical sensors and therapeutic agents in biological systems.
format Articulo
Articulo
author Romero, Juan José
Llansola-Portolés, Manuel J.
Dell'Arciprete, María Laura
Rodríguez, Hernán B.
Moore, Ana L.
González, Mónica Cristina
author_facet Romero, Juan José
Llansola-Portolés, Manuel J.
Dell'Arciprete, María Laura
Rodríguez, Hernán B.
Moore, Ana L.
González, Mónica Cristina
author_sort Romero, Juan José
title Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
title_short Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
title_full Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
title_fullStr Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
title_full_unstemmed Photoluminescent 1−2 nm Sized Silicon Nanoparticles: A Surface- Dependent System
title_sort photoluminescent 1−2 nm sized silicon nanoparticles: a surface- dependent system
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/170194
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AT rodriguezhernanb photoluminescent12nmsizedsiliconnanoparticlesasurfacedependentsystem
AT mooreanal photoluminescent12nmsizedsiliconnanoparticlesasurfacedependentsystem
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