TAILIEUCHUNG - Synthesis and Optical Properties of Cu2O and Au-Cu2O Core-shell Particles

Cuprous oxide (Cu2O) and Au-Cu2O core-shell nanoparticles were successfully synthesized using the chemical reduction method. The morphology of the synthesized pure Cu2Oparticles can be controlled by varying the amount of reducing agent . Due to their similar crystal structure and relatively small lattice mismatch Cu2O particles are nucleated and locally undergo an epitaxial growth on the surface of the multi-faceted Au seed resulting in a stellated icosahedra Au-Cu2O core-shell particle. | VNU Journal of Science: Mathematics – Physics, Vol. 33, No. 4 (2017) 73-79 Synthesis and Optical Properties of Cu2O and Au-Cu2O Core-shell Particles Sai Cong Doanh, Pham Nguyen Hai, Ngac An Bang* Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam Received 22 Septemberl 2017 Revised 33 October 2017; Accepted 25 October 2017 Abstract: Cuprous oxide (Cu2O) and Au-Cu2O core-shell nanoparticles were successfully synthesized using the chemical reduction method. The morphology of the synthesized pure Cu2Oparticles can be controlled by varying the amount of reducing agent . Due to their similar crystal structure and relatively small lattice mismatch Cu2O particles are nucleated and locally undergo an epitaxial growth on the surface of the multi-faceted Au seed resulting in a stellated icosahedra Au-Cu2O core-shell particle. The extinction spectrum of Cu2O particles offew hundred-nm in size is dominated by light scattering, while that of the stellated icosahedra AuCu2O core-shell particles exhibits the interband absorption of the Cu2O shell only. The interband absorption peak undergoes a blue shift as the shell gets thinner. No prominent SPR of the Au nanocore was observed due to a rather thick Cu2O shell. Keywords: Cu2O nanoparticle, Au-Cu2O core-shell nanoparticle, Surface Plasmon Resonance (SPR). 1. Introduction Cuprous oxide is one of the earliest discovered direct band gap semiconductor with a band gap energy of eV [1, 2], which makes it a promising material for applications in various fields such as sensor [3], photocatalysis [4], photoactivated water splitting [5] and lithium ion batteries [6]. In the last decade, Cu2O nanostructures have attracted significant attention because many interesting properties were enhanced greatly due to surface and quantum effects. Different micro and nanostructures of Cu2O such as nanocube [7], octahedral [8] and other symmetrical structures have been synthesized and studied but .

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