Visible surface diffusion of gold nanostructures on a paper at room temperature through localized surface plasmon resona
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.108
Visible surface diffusion of gold nanostructures on a paper at room temperature through localized surface plasmon resonance Nobuko Fukuda* and Sakae Manaka Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan
*Corresponding author: [email protected]
ABSTRACT
We visually observed color changes of discontinuous gold surfaces on paper substrates through localized surface plasmon resonance (LSPR) at room temperature due to surface diffusion of gold nanostructures. Isolated nanoparticles and an uncompleted nanosheet of gold were obtained by thermal vapor deposition. After preservation for 8 months in air at room temperature, the particle sizes and shapes remarkably changed with color changes. The surface diffusion of the discontinuous gold on the paper would be derived from solid-state dieting, resulting in the growth of the nanosheet defect and coalescence of the nanoparticles. This is due to the total energy minimization of the surfaces of gold nanostructures and the paper and the interface between gold and the paper.
INTRODUCTION Paper substrates for assay tools take some advantages of processability for fabricating structures for assay, disposability, portability, and cost performance. Recently, various kinds of paper-based sensing applications have been proposed such as 3D microfluidic [1] and microfluidic electrochemical devices [2], a device for measuring electric potentials [3], an ion-concentration-polarization device for separation and analysis [4], propagating surface plasmon resonance (SPR) [5], colorimetric localized surface plasmon resonance (LSPR) [6,7], and surface enhanced Raman scattering (SERS) devices [8]. The paper-based devices using colorimetric LSPR method provide label-free detection about molecular recognition reaction such as protein recognition [7]
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which proceed around metal nanoparticles on the paper substrates. The detection is based on changes in the dielectric constant around the metal nanoparticles due to adsorption of dielectric targets such as proteins. Here, we report transformation of gold structures on a paper surface due to surface diffusion with color changes through LSPR at room temperature and 80 |C. The phenomena make us imagine creation of different types of label-free LSPR sensors such as visible environmental indicators. EXPERIMENTAL METHODS A printing paper (G22MDP, NIPPON PAPER PAPYLIA Co, Ltd.) was used as a substrate. Gold was deposited by thermal vapor deposition onto the paper substrate. The deposition conditions were at 0.01 nm s-1 of the deposition rate for 200, 500, and 1000 s without heating of the paper substrates. The gold depositi
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