Future Perspectives of Photocatalysis

Coronado, Juan M.; Hernández‐Alonso, María D.; Fresno, Fernando; Portela, Raquel

doi:10.1007/978-1-4471-5061-9_17

Cited by 26 publications

(46 citation statements)

References 9 publications

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“…The strong electronic interaction between Au NPs and the defect sites of ZnO can be caused by near-surface resonance coupling of ZnO, which results in the quenching of the defect-related emission band. As a result, the band edge emission is enhanced and visible emission is quenched similar to previously reported works [ 1 , 29 – 32 ]. Moreover, in order to obtain insightful information for depicting the fast charge carriers as well as to elucidate the mechanism of charge transfer, TRPL spectra were recorded at room temperature for all samples ( Fig.…”

Section: Resultssupporting

confidence: 90%

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Ho¹,

Bui²,

Pham³

et al. 2018

Beilstein J. Nanotechnol.

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Pure and Au-decorated sub-micrometer ZnO spheres were successfully grown on glass substrates by simple chemical bath deposition and photoreduction methods. The analysis of scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images, energy-dispersive X-ray spectroscopy (EDS), UV–vis absorption, and photoluminescence (PL) spectra results were used to verify the incorporation of plasmonic Au nanoparticles (NPs) on the ZnO film. Time-resolved photoluminescence (TRPL) spectra indicated that a surface plasmonic effect exists with a fast rate of charge transfer from Au nanoparticles to the sub-micrometer ZnO sphere, which suggested the strong possibility of the use of the material for the design of efficient catalytic devices. The NO2 sensing ability of as-deposited ZnO films was investigated with different gas concentrations at an optimized sensing temperature of 120 °C. Surface decoration of plasmonic Au nanoparticles provided an enhanced sensitivity (141 times) with improved response (τRes = 9 s) and recovery time (τRec = 39 s). The enhanced gas sensing performance and photocatalytic degradation processes are suggested to be attributed to not only the surface plasmon resonance effect, but also due to a Schottky barrier between plasmonic Au and ZnO structures.

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Section: Resultssupporting

confidence: 90%

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Ho¹,

Bui²,

Pham³

et al. 2018

Beilstein J. Nanotechnol.

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“…In the tetragonal scheelite structure, the metal oxygen polyhedra are symmetric, with the cations at the center of the polyhedra. 7,37,38,[40][41][42] Concomitantly, the distortion of the V-O tetrahedra modifies the conduction band states (which are primarily V orbitals). 36 This results in local polar units in fergusonite, while the net polarity is zero when all summed over the entire centrosymmetric unit cell.…”

Section: Discussionmentioning

confidence: 99%

Ferroelastic domains improve photochemical reactivity: a comparative study of monoclinic and tetragonal (Bi_1−0.5xNa_0.5x)(V_1−xMo_x)O₄ ceramics

2016

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The relative reactivities of monoclinic and tetragonal BiVO4-based ceramics are described, focusing on the contributions of ferroelastic domains and surface orientations. First, the photo-oxidation of Mn 2+ on monoclinic BiVO4 is shown to be domain selective, occurring on the set of domains that is not active for the photo-reduction of Ag + . Next, the domain and orientation dependent photochemical reduction of Ag + is investigated for two samples in the co-doped family (Bi1-0.5xNa0.5x)(V1-xMox)O4: a monoclinic sample (x = 0.05) and a tetragonal sample (x = 0.175). Like BiVO4, the x = 0.05 sample has ferroelastic domains that exhibit contrast in piezoresponse force microscopy (PFM) and exhibit domain specific reactivity. The x = 0.175 sample has no domains, no PFM contrast, and uniform grain reactivity. The orientation dependence of Ag + reduction is similar for the two samples, with surfaces near (001) being more active than others. For any given orientation, however, the monoclinic sample is quantitatively more active than the same orientation in the tetragonal sample. These collected results are consistent with the hypothesis that monoclinic-structured BiVO4 ceramics have enhanced photochemical activity owing to ferroelastic domain-selective reactivity, which allows for local separation of photogenerated carriers and redox reactions.

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“…Tungsten trioxide is one of the most investigated transition metal oxide materials exhibiting a wide variety of novel properties. WO3 is a n-type semiconductor material with a wide energy band gap varying from 2.6 to 3.25 eV [29,259]. nanowires produced by thermal evaporation [270]; (c) nanoflowers produced by hydrothermal method [271]; (d) microspheres produced by hydrothermal method [272].…”

Section: Tungsten Trioxidementioning

confidence: 99%

Metal oxide nanostructures for sensor applications

Nunes

Pimentel

Gonçalves

et al. 2019

Semicond. Sci. Technol.

217

113

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Human health, environmental protection and safety are just a few examples of current humankind main concerns, that drive the scientific community to develop sensors able to precisely monitor and alert to possible harms in real time. Over the years, semiconductor metal oxide-based materials have been largely employed as sensors dedicated to several applications, being particularly interesting at the nanometer scale, since it is largely known that smaller crystallite size enhances sensor's performance. Moreover, these materials are highly appealing as they can be produced by low-cost wet-chemical synthesis routes and are in general nontoxic, earth abundant and low-cost. This manuscript extensively reviews the recent developments of nanostructured semiconductor metal oxide sensors ranging from gas to humidity sensors, including ultraviolet (UV) sensors and biosensors. Zinc oxide (ZnO), titanium dioxide (TiO2), tungsten trioxide (WO3), copper oxide (CuO and Cu2O), tin oxide (SnO and SnO2), and vanadium oxide (VO2, V2O5)-based sensors either as nanoparticles or as continuous films/layers are described. Their sensing properties are correlated to size, shape, presence of defects, doping elements, amongst other relevant parameters. Different techniques and methods of fabricating these materials are addressed. The review is concluded with novel approaches for functionalization and future perspectives for sensor developments.

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Future Perspectives of Photocatalysis

Cited by 26 publications

References 9 publications

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Ferroelastic domains improve photochemical reactivity: a comparative study of monoclinic and tetragonal (Bi_1−0.5xNa_0.5x)(V_1−xMo_x)O₄ ceramics

Metal oxide nanostructures for sensor applications

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Future Perspectives of Photocatalysis

Cited by 26 publications

References 9 publications

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Surface-plasmon-enhanced ultraviolet emission of Au-decorated ZnO structures for gas sensing and photocatalytic devices

Ferroelastic domains improve photochemical reactivity: a comparative study of monoclinic and tetragonal (Bi1−0.5xNa0.5x)(V1−xMox)O4 ceramics

Metal oxide nanostructures for sensor applications

Contact Info

Product

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About

Ferroelastic domains improve photochemical reactivity: a comparative study of monoclinic and tetragonal (Bi_1−0.5xNa_0.5x)(V_1−xMo_x)O₄ ceramics