“…The photocatalytic degradation result shows that the corn cob-like Au-ZnO nanorod is able to decompose ∼ 45 % RhB dye contaminants after 3 hours visible light irradiation, while bare ZnO nanorods can only decompose ∼ 27 % RhB dye solution under the same condition. [39] Comparing with these results, our site-specifically deposited Au-ZnO nanorod array synthesized through the pyroelectric approach is able to decompose ∼ 77 % after 3 hours reaction. The difference between the degradation rate might be ascribed to the morphology of the Au-ZnO nanorod array.…”
Section: Resultssupporting
confidence: 55%
“…Unlike our Au‐ZnO nanorods synthesized through the pyroelectric approach, the Au nanoparticles on the corn cob‐like Au–ZnO nanorod are arbitrarily distributed instead of deposited on the top of the ZnO. The photocatalytic degradation result shows that the corn cob‐like Au–ZnO nanorod is able to decompose ∼45 % RhB dye contaminants after 3 hours visible light irradiation, while bare ZnO nanorods can only decompose ∼27 % RhB dye solution under the same condition [39] . Comparing with these results, our site‐specifically deposited Au‐ZnO nanorod array synthesized through the pyroelectric approach is able to decompose ∼77 % after 3 hours reaction.…”
This paper introduces an alternative approach for the synthesis of site-specific gold-zinc oxide (Au-ZnO) nanorod array through the pyroelectric approach. The hydrothermally grown ZnO nanorod array on the Si substrate is served as the pyroelectric catalyst. Under rapid temperature oscillation, the gold salt precursor is reduced into gold nanoparticles around the tip of ZnO nanorods in aqueous solution. The hybrid structure shows a significant photoluminescence quenching in the visible emission spectrum of ZnO, which is due to the interaction of ZnO and gold nanoparticles. A Rhodamine B (RhB) degradation test under full spectrum sunlight illumination is conducted to demonstrate the photocatalytic performance of the Au-ZnO nanorod array. The mechanism behind the hydrothermal growth of ZnO, pyroelectric reduction of gold nanoparticles, and photoluminescence quenching of Au-ZnO is discussed. The findings of this work offer possible ways to the sustainable use of thermal energy, including harvesting waste heat through pyroelectric effect, and the site-specific synthesis of various nanomaterials with enhanced photocatalytic degradation capability.
“…The photocatalytic degradation result shows that the corn cob-like Au-ZnO nanorod is able to decompose ∼ 45 % RhB dye contaminants after 3 hours visible light irradiation, while bare ZnO nanorods can only decompose ∼ 27 % RhB dye solution under the same condition. [39] Comparing with these results, our site-specifically deposited Au-ZnO nanorod array synthesized through the pyroelectric approach is able to decompose ∼ 77 % after 3 hours reaction. The difference between the degradation rate might be ascribed to the morphology of the Au-ZnO nanorod array.…”
Section: Resultssupporting
confidence: 55%
“…Unlike our Au‐ZnO nanorods synthesized through the pyroelectric approach, the Au nanoparticles on the corn cob‐like Au–ZnO nanorod are arbitrarily distributed instead of deposited on the top of the ZnO. The photocatalytic degradation result shows that the corn cob‐like Au–ZnO nanorod is able to decompose ∼45 % RhB dye contaminants after 3 hours visible light irradiation, while bare ZnO nanorods can only decompose ∼27 % RhB dye solution under the same condition [39] . Comparing with these results, our site‐specifically deposited Au‐ZnO nanorod array synthesized through the pyroelectric approach is able to decompose ∼77 % after 3 hours reaction.…”
This paper introduces an alternative approach for the synthesis of site-specific gold-zinc oxide (Au-ZnO) nanorod array through the pyroelectric approach. The hydrothermally grown ZnO nanorod array on the Si substrate is served as the pyroelectric catalyst. Under rapid temperature oscillation, the gold salt precursor is reduced into gold nanoparticles around the tip of ZnO nanorods in aqueous solution. The hybrid structure shows a significant photoluminescence quenching in the visible emission spectrum of ZnO, which is due to the interaction of ZnO and gold nanoparticles. A Rhodamine B (RhB) degradation test under full spectrum sunlight illumination is conducted to demonstrate the photocatalytic performance of the Au-ZnO nanorod array. The mechanism behind the hydrothermal growth of ZnO, pyroelectric reduction of gold nanoparticles, and photoluminescence quenching of Au-ZnO is discussed. The findings of this work offer possible ways to the sustainable use of thermal energy, including harvesting waste heat through pyroelectric effect, and the site-specific synthesis of various nanomaterials with enhanced photocatalytic degradation capability.
“…In addition, the peak centered at 531.74 eV is associated with the surface-absorbed oxygen species [ 26 , 30 ]. Many documents have recorded that the surface oxygen species can produce primary active superoxide radicals and hydroxyl radicals, which are capable to trap photo induced electrons and holes to enhanced photocatalytic activities [ 8 , 31 ]. Fig.…”
In2O3 nanoparticles hybrid twins hexagonal disk (THD) ZnO with different ratios were fabricated by a hydrothermal method. The as-obtained ZnO/In2O3 composites are constituted by hexagonal disks ZnO with diameters of about 1 μm and In2O3 nanoparticles with sizes of about 20–50 nm. With the increase of In2O3 content in ZnO/In2O3 composites, the absorption band edges of samples shifted from UV to visible light region. Compared with pure ZnO, the ZnO/In2O3 composites show enhanced photocatalytic activities for degradation of methyl orange (MO) and 4-nitrophenol (4-NP) under solar light irradiation. Due to suitable alignment of their energy band-gap structure of the In2O3 and ZnO, the formation of type п heterostructure can enhance efficient separation of photo-generate electro-hole pairs and provides convenient carrier transfer paths.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-017-2233-3) contains supplementary material, which is available to authorized users.
“…Therefore, the effect of Au can be different for each of the obtained crystal morphologies. One of the most frequent geometries of ZnO is the rod/wire form [ 175 , 176 ]. In this construction, several beneficial properties of the composites can be exploited.…”
Section: Photocatalytic Application Of Gold Nanoparticlesmentioning
Metal and in particular noble metal nanoparticles represent a very special class of materials which can be applied as prepared or as composite materials. In most of the cases, two main properties are exploited in a vast number of publications: biocompatibility and surface plasmon resonance (SPR). For instance, these two important properties are exploitable in plasmonic diagnostics, bioactive glasses/glass ceramics and catalysis. The most frequently applied noble metal nanoparticle that is universally applicable in all the previously mentioned research areas is gold, although in the case of bioactive glasses/glass ceramics, silver and copper nanoparticles are more frequently applied. The composite partners/supports/matrix/scaffolds for these nanoparticles can vary depending on the chosen application (biopolymers, semiconductor-based composites: TiO2, WO3, Bi2WO6, biomaterials: SiO2 or P2O5-based glasses and glass ceramics, polymers: polyvinyl alcohol (PVA), Gelatin, polyethylene glycol (PEG), polylactic acid (PLA), etc.). The scientific works on these materials’ applicability and the development of new approaches will be targeted in the present review, focusing in several cases on the functioning mechanism and on the role of the noble metal.
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