Heteronanotrimers by Selective Photodeposition of Gold Nanodots on Janus-Type Cu2‒ xS/CuInS2 Heteronanocrystals

Fenghuan Zhao; Chenghui Xia; Junjie Hao; Celso de Mello Donegá; Marie-Hélène Delville; Jean-Pierre Delville

doi:10.1002/smll.202407045

Heteronanotrimers by Selective Photodeposition of Gold Nanodots on Janus-Type Cu2‒ xS/CuInS2 Heteronanocrystals

Fenghuan Zhao, Chenghui Xia, Junjie Hao, Celso de Mello Donegá, Marie-Hélène Delville^*, Jean-Pierre Delville^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

This study focuses on the development of environmentally friendly Au-Cu2-xS/CuInS2 heteronanotrimers. The chosen strategy relies on the laser photodeposition of a single gold nanodot (ND) onto Janus Cu2- xS/CuInS2 heteronanocrystals (HNCs). This method offers precise control over the number, location, and size (5 to 8 nm) of the Au NDs by adjusting laser power for the career production, concentration of hole scavenger for charge equilibration in redox reactions, and gold precursor concentration, and exposure time for the final ND size. The photoreduction of gold ions onto HNCs starts systematically at the Cu2- xS tip. The Au deposition then depends on the CuInS2 segment length. For short HNCs, stable Au-Cu2- xS/CuInS2 heteronanotrimers form, while long HNCs undergo a secondary photo-induced step: the initial Au ND is progressively oxidized, with concomitant deposition of a second gold ND on the CuInS2 side, to yield Au2S-Cu2- xS/CuInS2-Au heteronanotrimers. Results are rationalized by quantitative comparison with a model that describes the growth kinetics of NDs and Au-Cu2- xS transformation and emphasizes the importance of charge separation in predicting selective deposition in heteronanotrimer production. The key parameter controlling Au-Cu2‒ xS/CuInS2 HNCs is the photoinduced electric field gradient generated by charge separation, which is tailored by controlling the CuInS2 segment size.

Original language	English
Article number	e2407045
Journal	Small
Volume	20
Issue number	49
Early online date	17 Sept 2024
DOIs	https://doi.org/10.1002/smll.202407045
Publication status	Published - 5 Dec 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s). Small published by Wiley-VCH GmbH.

Funding

C.X. and J. H. contributed equally to this work. This project has received financial support from the CNRS through the MITI interdisciplinary programs (Action MITI: Nouveaux Mat\u00E9riaux 2020 and 2021). F. Z. acknowledges the China Scholarship Council (CSC) for the financial support (grant number 201808440510). The TEM observations were performed on the microscopes of the Plateforme Aquitaine de Caract\u00E9risation des Mat\u00E9riaux (PLACAMAT, UAR 3626, CNRS, Univ. de Bordeaux, Pessac, France). The authors acknowledge Marion Gayot for her discussions and help. The HRTEM and STEM were obtained using equipment either at PLACAMAT or at Southern University of Science and Technology Core Research Facilities, and the authors acknowledge the technical support from Dongsheng He and Yang Qiu in SUSTech CRF.

Funders	Funder number
Centre National de la Recherche Scientifique
China Scholarship Council	201808440510

Keywords

Janus structures
charge carriers
copper sulfide/copper indium sulfide
gold, heteronanotrimers
laser photodeposition

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Small - 2024 - Zhao - Heteronanotrimers by Selective Photodeposition of Gold Nanodots on Janus‐Type Cu2 xS CuInS2Final published version, 5.03 MBLicence: CC BY-NC-ND

Cite this

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title = "Heteronanotrimers by Selective Photodeposition of Gold Nanodots on Janus-Type Cu2‒ xS/CuInS2 Heteronanocrystals",

abstract = "This study focuses on the development of environmentally friendly Au-Cu2-xS/CuInS2 heteronanotrimers. The chosen strategy relies on the laser photodeposition of a single gold nanodot (ND) onto Janus Cu2- xS/CuInS2 heteronanocrystals (HNCs). This method offers precise control over the number, location, and size (5 to 8 nm) of the Au NDs by adjusting laser power for the career production, concentration of hole scavenger for charge equilibration in redox reactions, and gold precursor concentration, and exposure time for the final ND size. The photoreduction of gold ions onto HNCs starts systematically at the Cu2- xS tip. The Au deposition then depends on the CuInS2 segment length. For short HNCs, stable Au-Cu2- xS/CuInS2 heteronanotrimers form, while long HNCs undergo a secondary photo-induced step: the initial Au ND is progressively oxidized, with concomitant deposition of a second gold ND on the CuInS2 side, to yield Au2S-Cu2- xS/CuInS2-Au heteronanotrimers. Results are rationalized by quantitative comparison with a model that describes the growth kinetics of NDs and Au-Cu2- xS transformation and emphasizes the importance of charge separation in predicting selective deposition in heteronanotrimer production. The key parameter controlling Au-Cu2‒ xS/CuInS2 HNCs is the photoinduced electric field gradient generated by charge separation, which is tailored by controlling the CuInS2 segment size.",

keywords = "Janus structures, charge carriers, copper sulfide/copper indium sulfide, gold, heteronanotrimers, laser photodeposition",

author = "Fenghuan Zhao and Chenghui Xia and Junjie Hao and Doneg{\'a}, {Celso de Mello} and Marie-H{\'e}l{\`e}ne Delville and Jean-Pierre Delville",

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AU - Zhao, Fenghuan

AU - Xia, Chenghui

AU - Hao, Junjie

AU - Donegá, Celso de Mello

AU - Delville, Marie-Hélène

AU - Delville, Jean-Pierre

PY - 2024/12/5

Y1 - 2024/12/5

N2 - This study focuses on the development of environmentally friendly Au-Cu2-xS/CuInS2 heteronanotrimers. The chosen strategy relies on the laser photodeposition of a single gold nanodot (ND) onto Janus Cu2- xS/CuInS2 heteronanocrystals (HNCs). This method offers precise control over the number, location, and size (5 to 8 nm) of the Au NDs by adjusting laser power for the career production, concentration of hole scavenger for charge equilibration in redox reactions, and gold precursor concentration, and exposure time for the final ND size. The photoreduction of gold ions onto HNCs starts systematically at the Cu2- xS tip. The Au deposition then depends on the CuInS2 segment length. For short HNCs, stable Au-Cu2- xS/CuInS2 heteronanotrimers form, while long HNCs undergo a secondary photo-induced step: the initial Au ND is progressively oxidized, with concomitant deposition of a second gold ND on the CuInS2 side, to yield Au2S-Cu2- xS/CuInS2-Au heteronanotrimers. Results are rationalized by quantitative comparison with a model that describes the growth kinetics of NDs and Au-Cu2- xS transformation and emphasizes the importance of charge separation in predicting selective deposition in heteronanotrimer production. The key parameter controlling Au-Cu2‒ xS/CuInS2 HNCs is the photoinduced electric field gradient generated by charge separation, which is tailored by controlling the CuInS2 segment size.

AB - This study focuses on the development of environmentally friendly Au-Cu2-xS/CuInS2 heteronanotrimers. The chosen strategy relies on the laser photodeposition of a single gold nanodot (ND) onto Janus Cu2- xS/CuInS2 heteronanocrystals (HNCs). This method offers precise control over the number, location, and size (5 to 8 nm) of the Au NDs by adjusting laser power for the career production, concentration of hole scavenger for charge equilibration in redox reactions, and gold precursor concentration, and exposure time for the final ND size. The photoreduction of gold ions onto HNCs starts systematically at the Cu2- xS tip. The Au deposition then depends on the CuInS2 segment length. For short HNCs, stable Au-Cu2- xS/CuInS2 heteronanotrimers form, while long HNCs undergo a secondary photo-induced step: the initial Au ND is progressively oxidized, with concomitant deposition of a second gold ND on the CuInS2 side, to yield Au2S-Cu2- xS/CuInS2-Au heteronanotrimers. Results are rationalized by quantitative comparison with a model that describes the growth kinetics of NDs and Au-Cu2- xS transformation and emphasizes the importance of charge separation in predicting selective deposition in heteronanotrimer production. The key parameter controlling Au-Cu2‒ xS/CuInS2 HNCs is the photoinduced electric field gradient generated by charge separation, which is tailored by controlling the CuInS2 segment size.

KW - Janus structures

KW - charge carriers

KW - copper sulfide/copper indium sulfide

KW - gold, heteronanotrimers

KW - laser photodeposition

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ER -

Heteronanotrimers by Selective Photodeposition of Gold Nanodots on Janus-Type Cu2‒ xS/CuInS2 Heteronanocrystals

Abstract

Bibliographical note

Funding

Keywords

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