Synthesis and photoluminescence properties of ZnS nanobowl arrays via colloidal monolayer template
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NANO EXPRESS
Open Access
Synthesis and photoluminescence properties of ZnS nanobowl arrays via colloidal monolayer template Yanping Liu, Zhigang Li*, Wenwu Zhong, Li Zhang, Weiping Chen* and Qintao Li
Abstract Two-dimensional Zinc sulfide (ZnS) nanobowl arrays were synthesized via self-assembled monolayer polystyrene sphere template floating on precursor solution surface. A facile approach was proposed to investigate the morphology evolution of nanobowl arrays by post-annealing procedure. Photoluminescence (PL) measurement of as-grown nanoarrays shows that the spectrum mainly includes two parts: a purple emission peak at 382 nm and a broad blue emission band centering at 410 nm with a shoulder around 459 nm, and a blue emission band at 440 nm was obtained after the annealing procedure. ZnS nanoarrays with special morphologies and PL emission are benefits to their promising application in novel photoluminescence nanodevice. Keywords: Colloidal monolayer template; ZnS nanobowl arrays; Photoluminescence
Background Two-dimensional (2D) micro- and nanostructured arrays have attracted much interest because of their potential applications in optoelectronic device, gas sensors, solar cell, self-cleaning surface, etc. [1-5]. The applications and physical properties of 2D nanoarrays are relevant to their morphology. For example, bowl-like nanostructural arrays can be used in various fields, like nanoscale container and size selection of submicron spheres [6], light emitting diode surface [7], and chemical and biological sensors [8]. Therefore, the control of nanoarrays' morphology provides opportunities to tune and improve their properties and further promote their practical applications in various fields. Zinc sulfide (ZnS), as one of direct band gap semiconductor material, is a luminescent material well-known for its photoluminescence (PL) and electroluminescence [9,10], which enables wide applications in the fields of flat-panel display [11], sensor and lasers [12,13], and photodetectors [14]. Up to date, many efforts have been focused on the morphologies control and PL emissions of ZnS nanomaterials [15-20]. It was demonstrated that their PL emissions were dominated by defect states, such * Correspondence: [email protected]; [email protected] Department of Physics and Electronic Engineering, Taizhou University, Taizhou, Zhejiang 318000, China
as surface states, stoichiometric vacancies, and interstitial lattice defects [16-19]. However, the defect states in ZnS nanomaterial are active, especially at surface site, which will lead to unstable physical properties as well as poor reliability of ZnS-based nanodevices. It had been reported that the PL intensity of ZnS quantum dots diminished after a few days when left in the condition of normal laboratory lighting [21]. Therefore, such active defects in ZnS nanomaterials should be post-treated to keep the stable properties before practical applications. Post-annealing may be a facile and effective method to solve this problem. Defect states at material surface will be greatly
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