Exciton quenching due to copper diffusion limits the photocatalytic activity of CdS/Cu2S nanorod heterostructures

Ilan Jen-La Plante, Ayelet Teitelboim, Iddo Pinkas, Dan Oron, Taleb Mokari

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The formation of donor/acceptor junctions in hybrid nanomaterials is predicted to enhance photocatalytic activity as compared to single-component semiconductor systems. Specifically, nanomaterials containing a junction of n-type cadmium sulfide (CdS) and p-type copper sulfide (Cu2S) formed via cation exchange have been proposed as potential photocatalysts for reactions such as water splitting. Herein, we study the elemental distribution of Cu within these nanostructures using analytical transmission electron microscopy techniques. The resulting effects of this elemental distribution on photocatalytic activity and charge dynamics were further studied using a model photoreduction reaction and transient absorption spectroscopy. We find that copper diffusion in the hybrid nanostructure quenches the exciton lifetime and results in low photocatalytic activity; however, this effect can be partially mitigated via selective extraction. These results provide a deeper understanding of the physical processes within these hybrid nanostructures and will lead to more rational design of photocatalyst materials.

Original languageEnglish
Pages (from-to)590-596
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume5
Issue number3
DOIs
Publication statusPublished - Feb 6 2014

Fingerprint

Cadmium sulfide
cadmium sulfides
Nanorods
Excitons
nanorods
Heterojunctions
Copper
Quenching
Nanostructures
quenching
excitons
Photocatalysts
Nanostructured materials
copper
copper sulfides
water splitting
Sulfides
Absorption spectroscopy
photochemical reactions
Cations

Keywords

  • cation exchange
  • elemental diffusion
  • exciton dynamics
  • hybrid nanomaterials
  • photocatalysis

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Exciton quenching due to copper diffusion limits the photocatalytic activity of CdS/Cu2S nanorod heterostructures. / Jen-La Plante, Ilan; Teitelboim, Ayelet; Pinkas, Iddo; Oron, Dan; Mokari, Taleb.

In: Journal of Physical Chemistry Letters, Vol. 5, No. 3, 06.02.2014, p. 590-596.

Research output: Contribution to journalArticle

Jen-La Plante, Ilan ; Teitelboim, Ayelet ; Pinkas, Iddo ; Oron, Dan ; Mokari, Taleb. / Exciton quenching due to copper diffusion limits the photocatalytic activity of CdS/Cu2S nanorod heterostructures. In: Journal of Physical Chemistry Letters. 2014 ; Vol. 5, No. 3. pp. 590-596.
@article{6b4fd0f1bca24caea7b52f93eb9e4787,
title = "Exciton quenching due to copper diffusion limits the photocatalytic activity of CdS/Cu2S nanorod heterostructures",
abstract = "The formation of donor/acceptor junctions in hybrid nanomaterials is predicted to enhance photocatalytic activity as compared to single-component semiconductor systems. Specifically, nanomaterials containing a junction of n-type cadmium sulfide (CdS) and p-type copper sulfide (Cu2S) formed via cation exchange have been proposed as potential photocatalysts for reactions such as water splitting. Herein, we study the elemental distribution of Cu within these nanostructures using analytical transmission electron microscopy techniques. The resulting effects of this elemental distribution on photocatalytic activity and charge dynamics were further studied using a model photoreduction reaction and transient absorption spectroscopy. We find that copper diffusion in the hybrid nanostructure quenches the exciton lifetime and results in low photocatalytic activity; however, this effect can be partially mitigated via selective extraction. These results provide a deeper understanding of the physical processes within these hybrid nanostructures and will lead to more rational design of photocatalyst materials.",
keywords = "cation exchange, elemental diffusion, exciton dynamics, hybrid nanomaterials, photocatalysis",
author = "{Jen-La Plante}, Ilan and Ayelet Teitelboim and Iddo Pinkas and Dan Oron and Taleb Mokari",
year = "2014",
month = "2",
day = "6",
doi = "10.1021/jz500041g",
language = "English",
volume = "5",
pages = "590--596",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
number = "3",

}

TY - JOUR

T1 - Exciton quenching due to copper diffusion limits the photocatalytic activity of CdS/Cu2S nanorod heterostructures

AU - Jen-La Plante, Ilan

AU - Teitelboim, Ayelet

AU - Pinkas, Iddo

AU - Oron, Dan

AU - Mokari, Taleb

PY - 2014/2/6

Y1 - 2014/2/6

N2 - The formation of donor/acceptor junctions in hybrid nanomaterials is predicted to enhance photocatalytic activity as compared to single-component semiconductor systems. Specifically, nanomaterials containing a junction of n-type cadmium sulfide (CdS) and p-type copper sulfide (Cu2S) formed via cation exchange have been proposed as potential photocatalysts for reactions such as water splitting. Herein, we study the elemental distribution of Cu within these nanostructures using analytical transmission electron microscopy techniques. The resulting effects of this elemental distribution on photocatalytic activity and charge dynamics were further studied using a model photoreduction reaction and transient absorption spectroscopy. We find that copper diffusion in the hybrid nanostructure quenches the exciton lifetime and results in low photocatalytic activity; however, this effect can be partially mitigated via selective extraction. These results provide a deeper understanding of the physical processes within these hybrid nanostructures and will lead to more rational design of photocatalyst materials.

AB - The formation of donor/acceptor junctions in hybrid nanomaterials is predicted to enhance photocatalytic activity as compared to single-component semiconductor systems. Specifically, nanomaterials containing a junction of n-type cadmium sulfide (CdS) and p-type copper sulfide (Cu2S) formed via cation exchange have been proposed as potential photocatalysts for reactions such as water splitting. Herein, we study the elemental distribution of Cu within these nanostructures using analytical transmission electron microscopy techniques. The resulting effects of this elemental distribution on photocatalytic activity and charge dynamics were further studied using a model photoreduction reaction and transient absorption spectroscopy. We find that copper diffusion in the hybrid nanostructure quenches the exciton lifetime and results in low photocatalytic activity; however, this effect can be partially mitigated via selective extraction. These results provide a deeper understanding of the physical processes within these hybrid nanostructures and will lead to more rational design of photocatalyst materials.

KW - cation exchange

KW - elemental diffusion

KW - exciton dynamics

KW - hybrid nanomaterials

KW - photocatalysis

UR - http://www.scopus.com/inward/record.url?scp=84893862240&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84893862240&partnerID=8YFLogxK

U2 - 10.1021/jz500041g

DO - 10.1021/jz500041g

M3 - Article

VL - 5

SP - 590

EP - 596

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

SN - 1948-7185

IS - 3

ER -