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Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles. / Valenti, Marco; Venugopal, Anirudh; Tordera, Daniel; Jonsson, Magnus P.; Biskos, George; Schmidt-Ott, Andreas; Smith, Wilson A.

In: ACS Photonics, Vol. 4, No. 5, 17.05.2017, p. 1146-1152.

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Valenti, Marco ; Venugopal, Anirudh ; Tordera, Daniel ; Jonsson, Magnus P. ; Biskos, George ; Schmidt-Ott, Andreas ; Smith, Wilson A. / Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles. In: ACS Photonics. 2017 ; Vol. 4, No. 5. pp. 1146-1152.

BibTeX

@article{01b10488e1c64453b5c2b0ef88d533fb,
title = "Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles",
abstract = "The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices in order to extend the visible light utilization of semiconductors to light energies below their band gap. These nanoparticles absorb light and produce hot electrons and holes that can drive artificial photosynthesis reactions. For n-type semiconductor photoanodes decorated with PNPs, hot charge carriers are separated by a process called hot electron injection (HEI), where hot electrons with sufficient energy are transferred to the conduction band of the semiconductor. An important parameter that affects the HEI efficiency is the nanoparticle composition, since the hot electron energy is sensitive to the electronic band structure of the metal. Alloy PNPs are of particular importance for semiconductor/PNPs composites, because by changing the alloy composition their absorption spectra can be tuned to accurately extend the light absorption of the semiconductor. This work experimentally compares the HEI efficiency from Ag, Au, and Ag/Au alloy nanoparticles to TiO2 photoanodes for the photoproduction of hydrogen. Alloy PNPs not only exhibit tunable absorption but can also improve the stability and electronic and catalytic properties of the pure metal PNPs. In this work, we find that the Ag/Au alloy PNPs extend the stability of Ag in water to larger applied potentials while, at the same time, increasing the interband threshold energy of Au. This increasing of the interband energy of Au suppresses the visible-light-induced interband excitations, favoring intraband excitations that result in higher hot electron energies and HEI efficiencies.",
keywords = "alloy nanoparticles, artificial photosynthesis, gold nanoparticles, hot electron injection, hydrogen photoproduction, plasmonic nanoparticles, silver nanoparticles",
author = "Marco Valenti and Anirudh Venugopal and Daniel Tordera and Jonsson, {Magnus P.} and George Biskos and Andreas Schmidt-Ott and Smith, {Wilson A.}",
year = "2017",
month = "5",
day = "17",
doi = "10.1021/acsphotonics.6b01048",
language = "English",
volume = "4",
pages = "1146--1152",
journal = "ACS Photonics",
issn = "2330-4022",
publisher = "American Chemical Society (ACS)",
number = "5",

}

RIS

TY - JOUR

T1 - Hot Carrier Generation and Extraction of Plasmonic Alloy Nanoparticles

AU - Valenti, Marco

AU - Venugopal, Anirudh

AU - Tordera, Daniel

AU - Jonsson, Magnus P.

AU - Biskos, George

AU - Schmidt-Ott, Andreas

AU - Smith, Wilson A.

PY - 2017/5/17

Y1 - 2017/5/17

N2 - The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices in order to extend the visible light utilization of semiconductors to light energies below their band gap. These nanoparticles absorb light and produce hot electrons and holes that can drive artificial photosynthesis reactions. For n-type semiconductor photoanodes decorated with PNPs, hot charge carriers are separated by a process called hot electron injection (HEI), where hot electrons with sufficient energy are transferred to the conduction band of the semiconductor. An important parameter that affects the HEI efficiency is the nanoparticle composition, since the hot electron energy is sensitive to the electronic band structure of the metal. Alloy PNPs are of particular importance for semiconductor/PNPs composites, because by changing the alloy composition their absorption spectra can be tuned to accurately extend the light absorption of the semiconductor. This work experimentally compares the HEI efficiency from Ag, Au, and Ag/Au alloy nanoparticles to TiO2 photoanodes for the photoproduction of hydrogen. Alloy PNPs not only exhibit tunable absorption but can also improve the stability and electronic and catalytic properties of the pure metal PNPs. In this work, we find that the Ag/Au alloy PNPs extend the stability of Ag in water to larger applied potentials while, at the same time, increasing the interband threshold energy of Au. This increasing of the interband energy of Au suppresses the visible-light-induced interband excitations, favoring intraband excitations that result in higher hot electron energies and HEI efficiencies.

AB - The conversion of light to electrical and chemical energy has the potential to provide meaningful advances to many aspects of daily life, including the production of energy, water purification, and optical sensing. Recently, plasmonic nanoparticles (PNPs) have been increasingly used in artificial photosynthesis (e.g., water splitting) devices in order to extend the visible light utilization of semiconductors to light energies below their band gap. These nanoparticles absorb light and produce hot electrons and holes that can drive artificial photosynthesis reactions. For n-type semiconductor photoanodes decorated with PNPs, hot charge carriers are separated by a process called hot electron injection (HEI), where hot electrons with sufficient energy are transferred to the conduction band of the semiconductor. An important parameter that affects the HEI efficiency is the nanoparticle composition, since the hot electron energy is sensitive to the electronic band structure of the metal. Alloy PNPs are of particular importance for semiconductor/PNPs composites, because by changing the alloy composition their absorption spectra can be tuned to accurately extend the light absorption of the semiconductor. This work experimentally compares the HEI efficiency from Ag, Au, and Ag/Au alloy nanoparticles to TiO2 photoanodes for the photoproduction of hydrogen. Alloy PNPs not only exhibit tunable absorption but can also improve the stability and electronic and catalytic properties of the pure metal PNPs. In this work, we find that the Ag/Au alloy PNPs extend the stability of Ag in water to larger applied potentials while, at the same time, increasing the interband threshold energy of Au. This increasing of the interband energy of Au suppresses the visible-light-induced interband excitations, favoring intraband excitations that result in higher hot electron energies and HEI efficiencies.

KW - alloy nanoparticles

KW - artificial photosynthesis

KW - gold nanoparticles

KW - hot electron injection

KW - hydrogen photoproduction

KW - plasmonic nanoparticles

KW - silver nanoparticles

UR - http://www.scopus.com/inward/record.url?scp=85019625897&partnerID=8YFLogxK

UR - http://resolver.tudelft.nl/uuid:01b10488-e1c6-4453-b5c2-b0ef88d533fb

U2 - 10.1021/acsphotonics.6b01048

DO - 10.1021/acsphotonics.6b01048

M3 - Article

VL - 4

SP - 1146

EP - 1152

JO - ACS Photonics

T2 - ACS Photonics

JF - ACS Photonics

SN - 2330-4022

IS - 5

ER -

ID: 22370630