Influence of pH on the preparation of dispersed Ag–TiO2 nanocomposite

Modified photodeposition of uniform Ag nanoparticles on TiO2 with superior catalytic and antibacterial activities

“…The photoelectron peaks of both the Ag 3d 5/2 and Ag 3d 3/2 are basically symmetrical with binding energy (BE) of 368.3 and 374.2 eV, respectively, and the 6.0 eV difference between the BE of Ag 3d 5/2 and Ag 3d 3/2 peaks is also characteristic of metallic Ag 3d states. The [21][22][23][24][25][26][27][28][29][30]. Combined with the results of XRD analysis, it can be concluded that Ag particles are not oxidized in the photodeposition process under UV irradiation.…”

“…It is the characteristic absorption of TiO 2 corresponding to the charge transfer process from the valence band to conduction band in anatase TiO 2 [37][38][39][40]. The photodeposited Ag NPs cause significant changes to the absorption spectrum of TiO 2 , resulting in high absorbance from 400 nm to entire visible region, which is characteristic of surface plasmon absorption corresponding to deposited metallic Ag NPs on TiO 2 surfaces [21][22][23][24][25][26][27][28][29]. The absorbance in the visible region increased firstly and then decreased gradually from 400 to 800 nm for the TiO 2 / Ag composites, indicating that Ag NPs on TiO 2 are not evenly distributed [40].…”

“…Therefore, the stability is one of the most important factors for their practical applications in nanoscience and nanotechnology. To stabilize Ag NPs, an efficient measure is to immobilize highly dispersed Ag NPs on inexpensive substrates such as SiO 2 , Fe 3 O 3 , ZnO, ZrO 2 , CeO 2 , Al 2 O 3 , C materials and TiO 2 [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Particular attention has been focused on supporting and binding AgNPs onto TiO 2 surface to improve catalytic and photocatalytic performance, and antimicrobial activity due to the synergistic interaction between Ag NPs and TiO 2 support [20][21][22][23][24][25][26][27][28].…”

“…Photodeposition is a facile and effective method to deposit various noble metal NPs on the surface of TiO 2 under UV light. Nevertheless, it is difficult to produce uniform Ag NPs that have very small size and are strongly anchored on the surface of TiO 2 by conventional photodeposition [29][30][31].…”

ZrO2@Ag composite catalyst for hydrogenation reduction of organic dye: Preparation and characterization as well as catalytic performance evaluation

“…Therefore, the stability of Ag NPs is critical to their practical applications in nanoscience and nanotechnology. In order to stabilize Ag NPs and obtain excellent properties as well as cheap cost, Ag NPs are generally immobilized and dispersed on a variety of inorganic materials such as SiO 2 , Fe 3 O 3 , ZnO, ZrO 2 , CeO 2 , Al 2 O 3 , C materials, TiO 2 and so on [13][14][15][16][17][18][19][20][21][22][23][24][25]. As an important ceramic material, ZrO 2 has widespread potential applicability in thermal barrier coating, electro-optical material, gas sensing material, luminescent material and catalyst, due to its high thermal stability and chemical stability as well as excellent resistance to acid and alkali [26][27][28][29][30].…”