Core/Shell Ag/SnO2 Nanowires for Visible Light Photocatalysis

Abstract

This study presents core/shell Ag/SnO2 nanowires (Ag/SnO2NWs) as a new photocatalyst for the rapid degradation of organic compounds by the light from the visible range. AgNWs after coating with a SnO2 shell change optical properties and, due to red shift of the absorbance maxima of the longitudinal and transverse surface plasmon resonance (SPR), modes can be excited by the light from the visible light region. Rhodamine B and malachite green were respectively selected as a model organic dye and toxic one that are present in the environment to study the photodegradation process with a novel one-dimensional metal/semiconductor Ag/SnO2NWs photocatalyst. The degradation was investigated by studying time-dependent UV/Vis absorption of the dye solution, which showed a fast degradation process due to the presence of Ag/SnO2NWs photocatalyst. The rhodamine B and malachite green degraded after 90 and 40 min, respectively, under irradiation at the wavelength of 450 nm. The efficient photocatalytic process is attributed to two phenomenon surface plasmon resonance effects of AgNWs, which allowed light absorption from the visible range, and charge separations on the Ag core and SnO2 shell interface of the nanowires which prevents recombination of photogenerated electron-hole pairs. The presented properties of Ag/SnO2NWs can be used for designing efficient and fast photodegradation systems to remove organic pollutants under solar light without applying any external sources of irradiation.

Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides

“…[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] The electron affinity (w) of ZnO, SnO 2 , and Zn 2 SnO 4 has been found to be 4.20, 4.20, and 4.50 eV, respectively, 10,39,40,57,58 while the work functions (F) of ZnO, SnO 2 , and Zn 2 SnO 4 have been reported to be 4.71, 4.84, and 4.90 eV, respectively. [59][60][61][62][63][64] It shall be noted that the Fermi level inferred from the literature can only be used for qualitative discussion of oxygen vacancies. Their correct values shall be measured by a suitable method such as ultraviolet photoemission spectroscopy (UPS) in a future study.…”

Sn(IV) Porphyrin-Based Ionic Self-Assembled Nanostructures and Their Application in Visible Light Photo-Degradation of Malachite Green

“…The reaction mixture was analyzed after 30 min irradiation of visible light using ESI-MS (Figure S19) to study the details of the degradation pathway of the MG dye. New peaks appeared in the mass spectra imply that the MG dye was degraded into new small molecules [52,53]. By analyzing mass spectral data in Figure S19, possible intermediates for the degradation of the MG dye are given in Figure 10.…”

First-principles study of mercaptoundecanoic acid molecule adsorption and gas molecule penetration onto silver surface: an insight for corrosion protection

“…In recent years, there have been developed several kinds of passivation materials satisfying the above terms for Ag NW transparent electrodes. 1,[24][25][26] In particular, organic short molecules have been found to show many advantages over other materials. In fact, the strong binding between ligands and Ag atoms can enhance the chemical stability, while the transparency, conductivity and exibility of the Ag electrodes are little damaged.…”

“…Silver nanowire (NW) networks have attracted signicant research attention in numerous applications including transparent exible conductors, strain sensors, light emitting diodes (LEDs), liquids crystal displays (LCD), self-healing electronic devices and solar cells. [1][2][3][4][5] This is due to their superior material properties such as high mechanical exibility and high electrical conductivity combined with reasonable transparency. 6,7 In particular, Ag NW networks show a great potentiality of promising transparent electrodes as an alternative to the lms of metal oxides such as indium tin oxide (ITO).…”