Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al2O3/Au nanoparticles

doi:10.1088/1674-1056/28/6/068103

Abstract

We present a self-assembly method to prepare array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al₂O₃ film modified by gold nanoparticles. The photoluminescence (PL) spectra of nanowires are in situ measured by using a scanning near-field optical microscopy (SNOM) probe tip with 100-nm aperture on the scanning near-field optical microscope. The results show that the binding sites from the edge of porous Al₂O₃ nanopores are combined with the carboxyl of CdSe quantum dots' surface to form an array of CdSe nanowires in the process of losing background solvent because of the gold nanoparticles filling the nano-holes of porous Al₂O₃ film. Compared with the area of non-self-assembled nano-wire, the fluorescence on the Al₂O₃/Au/CdSe interface is significantly enhanced in the self-assembly nano-wire regions due to the electron transfer conductor effect of the gold nanoparticles' surface. In addition, its full width at half maximum (FWHM) is also obviously widened. The method of enhancing fluorescence and energy transfer can widely be applied to photodetector, photocatalysis, optical display, optical sensing, and biomedical imaging, and so on.

Keywords: enhanced photoluminescence CdSe nano-wire colloidal self-assembled method porous Al₂O₃ film

Received: 29 January 2019
Revised: 17 March 2019
Accepted manuscript online:

PACS:	81.07.Gf	(Nanowires)
	81.16.Dn	(Self-assembly)
	67.25.dp	(Films)
	25.20.Lj	(Photoproduction reactions)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 61741505 and 61865002), the Guizhou Provincial Science and Technology Support Plan, China (Grant No QKHZ [2017]2887), the Guiding Local Science and Technology Development Plan of the Central Government of China (Grant No. QKZYD [2017]4004), the Guizhou Province Education and Teaching Reform for Graduate Student (Grant No. QJYH-JG [2016]15), the Guizhou University Introduces Talent Projects, China (Grant No. 2016002), and the Talents of Guizhou Municipal Science and Technology Cooperation Platform, China (Grant No. [2018]5781).

Corresponding Authors: Zhong-Chen Bai
E-mail: zcbai@gzu.edu.cn

Cite this article:

Xin Zhang(张欣), Li-Ping Shao(邵丽萍), Man Peng(彭嫚), Zhong-Chen Bai(白忠臣), Zheng-Ping Zhang(张正平), Shui-Jie Qin(秦水介) Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al₂O₃/Au nanoparticles 2019 Chin. Phys. B 28 068103

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Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al2O3/Au nanoparticles

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Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al₂O₃/Au nanoparticles