Synthesis and application of palladium nanomaterials for sensing and catalysis

Jianli Zou

Research output: ThesisDoctoral Thesis

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Abstract

[Truncated abstract] Palladium (Pd) nanomaterials have received considerable research interests in hydrogen purification, hydrogen sensing and catalysis. For these large scale industrial applications, the development of a feasible synthetic method is paramount. To this end, a scalable method to synthesise Pd nanomaterials under continuously fluidic flow at room temperature using hydrogen gas as a reducing agent has been developed. Spinning Disc Processing (SDP) as a platform of continuous flow provided an intense micro-mixing on a rapidly rotating disc, which facilitated hydrogen gas reducing Pd(II) to Pd(0) in seconds. Three different Pd based nano-materials have been synthesised using SDP, namely, surfactant free Pd bare nano-rosettes, Pd-PVP nanospheres, and Pd-Cellulose nanocomposites. The application of the three different aforementioned Pd nano-structures in hydrogen gas sensing has been explored. 1. Pd bare nano-rosette structure possessed a high surface-to-volume ratio that rendered an abundance of active surface available for hydrogen adsorption. These bare Pd nano-rosettes were devoid of the possible lag in response time caused by a passivated Pd surface which facilitated real time hydrogen gas sensing compared with surfactant stabilised Pd nanomaterials. 2. Pd-PVP nanospheres were synthesised in the presence of poly(N-vinyl-2-pyrrolidone) (PVP). Here, PVP acted as scaffold holding a large number of Pd nanocrystals together into a 3-dimentional sphere.
Original languageEnglish
QualificationDoctor of Philosophy
Publication statusUnpublished - 2011

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