Synthesis and visible-light-induced catalytic activity of Ag₂S-coupled TiO₂nanoparticles and nanowires

Abstract

We present the synthesis and visible-light-induced catalytic activity of Ag(2)S-coupled TiO(2) nanoparticles (NPs) and TiO(2) nanowires (NWs). Through a simple wet chemical process from a mixture of peroxo titanic acid (PTA) solution, thiourea and AgAc, a composite of Ag(2)S NPs and TiO(2) NPs with sizes of less than 7 nm was formed. When the NP composite was further treated with NaOH solution followed by annealing at ambient conditions, a new nanocomposite material comprising Ag(2)S NPs on TiO(2) NWs was created. Due to the coupling with such a low bandgap material as Ag(2)S, the TiO(2) nanocomposites could have a visible-light absorption capability much higher than that of pure TiO(2). As a result, the synthesized Ag(2)S/TiO(2) nanocomposites exhibited much higher catalytic efficiency for the decomposition of methyl orange than commercial TiO(2) (Degussa P25, Germany) under visible light.

Facile synthesis, characterization and recyclable photocatalytic activity of Ag2WO4@g-C3N4

“…The activity of silver based catalysts (SBC) is superior when compared to the traditional photocatalysts. According to literatures, Ag 2 S [14][15][16][17][18], Ag 3 PO 4 [19][20][21][22][23][24][25][26][27][28][29][30][31][32], Ag 2 CrO 4 [33][34][35][36][37], Ag 3 AsO 4 [38,39], AgBr [40][41][42][43][44][45][46][47][48][49][50], AgI [51][52][53][54][55][56], Ag 2 CO 3 [57][58][59][60][61][62][63][64], A...…”

Enhanced charge-carrier transfer by CdS and Ag2S quantum dots co-sensitization for TiO2 nanotube arrays

“…Therefore, two fundamental scientific issues in this research area are to increase the visible light response of TiO 2 and to reduce the recombination rate of the photoinduced charge carriers. To achieve these goals, doping with transition metal or non-metal elements, surface deposition of noble metals, surface composite formation with semiconductors, sensitization with narrow-bandgap semiconductor quantum dots (QDs), and sensitization with dyes have been investigated [5][6][7][8][9][10].…”

Optical limiting response of Ag2S nanoparticles synthesized by laser ablation of silver target in DMSO

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