CuO/ZnO Heterostructured Nanorods: Photochemical Synthesis and the Mechanism of H₂S Gas Sensing

Abstract

Supporting information I: SEM images of CuO/ZnO heterostructured nanorod Figure S1 shows the growth steps of CuO nano-spikes on surface of ZnO nanorods by photochemical method. CuO nanospikes were grown not only on tips of ZnO nanorods but also on body surface of ZnO nanorods. The formation of CuO nucleation was observed at low Cu slat concentration of 0.025 mM under short time (~ 2 mins) irradiation of UV by SEM analysis. The surface coverage level of fully grown CuO nanospikes on surface of ZnO nanorods becomes larger as Cu salt concentration increases (0.025~ 0.1mM). After formation of high surface coverage, the CuO is formed like a porous CuO layer and the thickness of CuO layer increases on ZnO.

Fabrication of a low-concentration H2S gas sensor using CuO nanorods decorated with Fe2O3 nanoparticles

“…CuO is a well-known sensor material for H 2 S gas [13][14][15]. It is a p-type material that catalytically oxidizes adsorbed H 2 S gas.…”

Structural, optical, vibrational and photoluminescence studies of Sn-doped MoO 3 sprayed thin films

“…This material has also important properties which are explored for several applications such as gas sensors [7][8][9][10], selective catalytic [11,12] and selective oxidation catalysis. This transition-metal oxide [13] has been studied as attractive candidates of chromogenic materials owing to their fast response, high coloration efficiency and long-term stability.…”

Intrinsic characteristic and mechanism in enhancing H2S sensing of Cd-doped α-MoO3 nanobelts

“…H 2 S, as a toxic gas, presenced in air pollution not only destroys the environment, but also is badly harmful to human body [1,2], so, H 2 S is an important target gas for ␣-MoO 3 gas sensors. One-dimensional (1D) ␣-MoO 3 [3,4] along with most of other semiconducting metal oxides, such as WO 3 , ZnO, and SnO 2 , etc.…”