Volume 136, Issue 23 e202403645
Zuschrift

Two-Orders-of-Magnitude Enhancement of Photoinitiation Activity via a Simple Surface Engineering of Metal Nanoclusters

Jin Tang

Jin Tang

Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization; Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310058 China

authors contributed equally to this work

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Ning Xu

Ning Xu

School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058 China

Department of Physics, School of Physical Science and Technology, Ningbo University, Ningbo, 315211 China

authors contributed equally to this work

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An Ren

An Ren

The State Key Laboratory of Fluid Power and Mechatronic Systems. School of Mechanical Engineering, Zhejiang University, Hangzhou, 310058 China

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Prof. Liang Ma

Prof. Liang Ma

The State Key Laboratory of Fluid Power and Mechatronic Systems. School of Mechanical Engineering, Zhejiang University, Hangzhou, 310058 China

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Prof. Wenwu Xu

Prof. Wenwu Xu

Department of Physics, School of Physical Science and Technology, Ningbo University, Ningbo, 315211 China

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Prof. Zhongkang Han

Corresponding Author

Prof. Zhongkang Han

School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310058 China

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Zijie Chen

Zijie Chen

Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization; Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310058 China

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Prof. Qi Li

Corresponding Author

Prof. Qi Li

Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization; Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310058 China

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First published: 26 March 2024

Abstract

Development of high-performance photoinitiator is the key to enhance the printing speed, structure resolution and product quality in 3D laser printing. Here, to improve the printing efficiency of 3D laser nanoprinting, we investigate the underlying photochemistry of gold and silver nanocluster initiators under multiphoton laser excitation. Experimental results and DFT calculations reveal the high cleavage probability of the surface S−C bonds in gold and silver nanoclusters which generate multiple radicals. Based on this understanding, we design several alkyl-thiolated gold nanoclusters and achieve a more than two-orders-of-magnitude enhancement of photoinitiation activity, as well as a significant improvement in printing resolution and fabrication window. Overall, this work for the first time unveils the detailed radical formation pathways of gold and silver nanoclusters under multiphoton activation and substantially improves their photoinitiation sensitivity via surface engineering, which pushes the limit of the printing efficiency of 3D laser lithography.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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