Additive manufacture of complex 3D Au-containing nanocomposites by simultaneous two-photon polymerisation and photoreduction

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Hu, Qin, Sun, Xue-Zhong, Parmenter, Christopher D.J., Fay, Michael W., Smith, Emily F., Rance, Graham A., He, Yinfeng, Zhang, Fan, Liu, Yaan, Irvine, Derek, Tuck, Christopher, Hague, Richard J.M. and Wildman, Ricky D. (2017) Additive manufacture of complex 3D Au-containing nanocomposites by simultaneous two-photon polymerisation and photoreduction. Scientific Reports, 7 . 17150/1-17150/9. ISSN 2045-2322

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Official URL: https://www.nature.com/articles/s41598-017-17391-1

Abstract

The fabrication of complex three-dimensional gold-containing nanocomposite structures by simultaneous two-photon polymerisation and photoreduction is demonstrated. Increased salt delivers reduced feature sizes down to line widths as small as 78nm, a level of structural intricacy that represents a significant advance in fabrication complexity. The development of a general methodology to efficiently mix pentaerythritol triacrylate (PETA) with gold chloride hydrate (HAuCl4∙3H2O) is reported, where the gold salt concentration is adjustable on demand from zero to 20wt%. For the frst-time 7-Diethylamino-3-thenoylcoumarin (DETC) is used as the photoinitiator. Only 0.5wt% of DETC was required to promote both polymerisation and photoreduction of up to 20wt% of gold salt. This efficiency is the highest reported for Au-containing composite fabrication by two-photon lithography. Transmission Electron Microscopy (TEM) analysis confirmed the presence of small metallic nanoparticles (5.4±1.4nm for long axis / 3.7±0.9nm for short axis) embedded within the polymer matrix, whilst X-ray Photoelectron Spectroscopy (XPS) confirmed that they exist in the zero valent oxidation state. UV-vis spectroscopy defined that they exhibit the property of localised surface plasmon resonance (LSPR). The capability demonstrated in this study opens up new avenues for a range of applications, including plasmonics, metamaterials, flexible electronics and biosensors.

Item Type:

Article

RIS ID:

https://nottingham-repository.worktribe.com/output/899053

Schools/Departments:

University of Nottingham, UK > Faculty of Engineering > Department of Chemical and Environmental Engineering
University of Nottingham, UK > Faculty of Science > School of Chemistry

Identification Number:

https://doi.org/10.1038/s41598-017-17391-1

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