TiO2 on Gold Nanostars Enhances Photocatalytic Water Reduction in the Near-Infrared Regime

Supriya Atta, Ashley M. Pennington, Fuat E. Celik, Laura Fabris

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Utilizing low-energy infrared light to drive photocatalytic reactions is an important goal for efficient H2 evolution from water. While traditional approaches deposit small metal clusters onto TiO2, we grow the semiconductor on the metal to enable more efficient light absorption mediated by the plasmonic nanomaterial. Gold nanostars exhibit strong localized surface plasmon resonance (LSPR) in the near infrared, with intense electric fields at the tips, which enables the generation of hot electrons. By epitaxially growing a conformal shell of crystalline TiO2 onto the nanostars via a low-temperature hydrothermal protocol, we have observed substantial enhancement in H2 generation, in line with our hypothesis that hot electrons can be efficiently generated at the nanostar tips and injected across the metal-semiconductor interface. Future studies targeting morphology- and LSPR-tunability promise to bring important insight into photoexcitation by low-energy wavelengths in hydrogen evolution.

Original languageEnglish
JournalChem
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Gold
near infrared
Semiconductors
Surface Plasmon Resonance
Hot electrons
gold
Metals
Surface plasmon resonance
Infrared radiation
Water
metal
Electrons
Semiconductor materials
electron
Nanostructures
Photoexcitation
Nanostructured materials
water
Light absorption
targeting

Keywords

  • anatase
  • epitaxial growth
  • gold nanostars
  • hydrogen
  • localized surface plasmon resonance
  • photocatalysis
  • SDG7: Affordable and clean energy
  • TEM
  • TiO
  • UV-vis
  • XRD

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Biochemistry, medical
  • Materials Chemistry

Cite this

TiO2 on Gold Nanostars Enhances Photocatalytic Water Reduction in the Near-Infrared Regime. / Atta, Supriya; Pennington, Ashley M.; Celik, Fuat E.; Fabris, Laura.

In: Chem, 01.01.2018.

Research output: Contribution to journalArticle

@article{532f656d1377442da066db5883e6764c,
title = "TiO2 on Gold Nanostars Enhances Photocatalytic Water Reduction in the Near-Infrared Regime",
abstract = "Utilizing low-energy infrared light to drive photocatalytic reactions is an important goal for efficient H2 evolution from water. While traditional approaches deposit small metal clusters onto TiO2, we grow the semiconductor on the metal to enable more efficient light absorption mediated by the plasmonic nanomaterial. Gold nanostars exhibit strong localized surface plasmon resonance (LSPR) in the near infrared, with intense electric fields at the tips, which enables the generation of hot electrons. By epitaxially growing a conformal shell of crystalline TiO2 onto the nanostars via a low-temperature hydrothermal protocol, we have observed substantial enhancement in H2 generation, in line with our hypothesis that hot electrons can be efficiently generated at the nanostar tips and injected across the metal-semiconductor interface. Future studies targeting morphology- and LSPR-tunability promise to bring important insight into photoexcitation by low-energy wavelengths in hydrogen evolution.",
keywords = "anatase, epitaxial growth, gold nanostars, hydrogen, localized surface plasmon resonance, photocatalysis, SDG7: Affordable and clean energy, TEM, TiO, UV-vis, XRD",
author = "Supriya Atta and Pennington, {Ashley M.} and Celik, {Fuat E.} and Laura Fabris",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.chempr.2018.06.004",
language = "English",
journal = "Chem",
issn = "2451-9294",
publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - TiO2 on Gold Nanostars Enhances Photocatalytic Water Reduction in the Near-Infrared Regime

AU - Atta, Supriya

AU - Pennington, Ashley M.

AU - Celik, Fuat E.

AU - Fabris, Laura

PY - 2018/1/1

Y1 - 2018/1/1

N2 - Utilizing low-energy infrared light to drive photocatalytic reactions is an important goal for efficient H2 evolution from water. While traditional approaches deposit small metal clusters onto TiO2, we grow the semiconductor on the metal to enable more efficient light absorption mediated by the plasmonic nanomaterial. Gold nanostars exhibit strong localized surface plasmon resonance (LSPR) in the near infrared, with intense electric fields at the tips, which enables the generation of hot electrons. By epitaxially growing a conformal shell of crystalline TiO2 onto the nanostars via a low-temperature hydrothermal protocol, we have observed substantial enhancement in H2 generation, in line with our hypothesis that hot electrons can be efficiently generated at the nanostar tips and injected across the metal-semiconductor interface. Future studies targeting morphology- and LSPR-tunability promise to bring important insight into photoexcitation by low-energy wavelengths in hydrogen evolution.

AB - Utilizing low-energy infrared light to drive photocatalytic reactions is an important goal for efficient H2 evolution from water. While traditional approaches deposit small metal clusters onto TiO2, we grow the semiconductor on the metal to enable more efficient light absorption mediated by the plasmonic nanomaterial. Gold nanostars exhibit strong localized surface plasmon resonance (LSPR) in the near infrared, with intense electric fields at the tips, which enables the generation of hot electrons. By epitaxially growing a conformal shell of crystalline TiO2 onto the nanostars via a low-temperature hydrothermal protocol, we have observed substantial enhancement in H2 generation, in line with our hypothesis that hot electrons can be efficiently generated at the nanostar tips and injected across the metal-semiconductor interface. Future studies targeting morphology- and LSPR-tunability promise to bring important insight into photoexcitation by low-energy wavelengths in hydrogen evolution.

KW - anatase

KW - epitaxial growth

KW - gold nanostars

KW - hydrogen

KW - localized surface plasmon resonance

KW - photocatalysis

KW - SDG7: Affordable and clean energy

KW - TEM

KW - TiO

KW - UV-vis

KW - XRD

UR - http://www.scopus.com/inward/record.url?scp=85049482683&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85049482683&partnerID=8YFLogxK

U2 - 10.1016/j.chempr.2018.06.004

DO - 10.1016/j.chempr.2018.06.004

M3 - Article

JO - Chem

JF - Chem

SN - 2451-9294

ER -