Preparation of TeO2 based thin films by nonhydrolytic sol–gel process

Wei, Hengyong; Lin, Jian; Huang, Wenhai; Feng, Zimin; Li, Dongwei

doi:10.1016/j.mseb.2009.07.001

Cited by 30 publications

(10 citation statements)

References 35 publications

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“…In addition, α-TeO 2 diffractions were found in both films. 30,34 The optical microscopy and XRD results are consistent with the opaque white appearance and overall reduced transmission of the S-130-400 and S-130-500 films.…”

Section: Resultssupporting

confidence: 68%

“…Based upon previous observations for other tellurite-based glass films 42 and bulk tellurite glass, 43 this color appearance is attributed to the presence of reduced tellurium species or metallic-Te. 30,35,42 …”

Section: Resultsmentioning

confidence: 99%

“…The preparation of TeO 2 -based films using the conventional hydrolytic sol–gel (HSG) chemistry suffers from the Te-alkoxide precursor readily undergoing detrimental hydrolysis instead of the desired polymerization. 31,32 To circumvent this obstacle, a non-hydrolytic sol–gel (NHSG) chemical route was developed, 29,30 with Na 2 O and ZnO introduced as network modifier 30 and network intermediate, 29,33 respectively. Yet hitherto, the NHSG route has not been developed to a procedure that completely prevents the formation of metallic-Te and/or oxide crystals during the preparation of TeO 2 -based sol–gel glass films.…”

Section: Introductionmentioning

confidence: 99%

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Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

et al. 2020

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Section: Resultssupporting

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

et al. 2020

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“…830 cm -1 (Table 1). Although to the best of our knowledge experimental the vibrational signature of this surface species has not been identified, it is known that Te-O vibrational modes in amorphous or crystalline TeO 2 are at 780 cm -1 or less [54], whereas Ar matrix-isolated TeO and OTeO molecules exhibit Te-O and symmetric/asymmetric O-Te-O stretching modes at 783 and 823/841 cm -1 , respectively [55]. These experimental observations are in broad agreement with our theoretical results for the surface Te-O species.…”

Section: Cluster Modelsmentioning

confidence: 97%

Propane Ammoxidation Over the Mo–V–Te–Nb–O M1 Phase: Reactivity of Surface Cations in Hydrogen Abstraction Steps

Muthukumar

et al. 2011

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Density functional theory calculations (GGA-PBE) have been performed to investigate the adsorption of C 3 (propane, isopropyl, propene, and allyl) and H species on the proposed active center present in the surface ab planes of the bulk Mo-V-Te-Nb-O M1 phase in order to better understand the roles of the different surface cations in propane ammoxidation. Modified cluster models were employed to isolate the closely spaced V=O and Te=O from each other and to vary the oxidation state of the V cation. While propane and propene adsorb with nearly zero adsorption energy, the isopropyl and allyl radicals bind strongly to V=O and Te=O with adsorption energies, DE, being B-1.75 eV, but appreciably more weakly on other sites, such as Mo=O, bridging oxygen (Mo-O-V and Mo-O-Mo), and empty metal apical sites (DE [ -1 eV). Atomic H binds more strongly to Te=O (DE B -3 eV) than to all the other sites, including V=O (DE = -2.59 eV). The reduction of surface oxo groups by dissociated H and their removal as water are thermodynamically favorable except when both H atoms are bonded to the same Te=O. Consistent with the strong binding of H, Te=O is markedly more active at abstracting the methylene H from propane (E a B 1.01 eV) than V=O (E a = 1.70 eV on V 5? =O and 2.13 eV on V 4? =O). The higher-thanobserved activity and the loose binding of Te=O moieties to the mixed metal oxide lattice of M1 raise the question of whether active Te=O groups are in fact present in the surface ab planes of the M1 phase under propane ammoxidation conditions.

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“…These were studied already by Bradley in the 1950s and were used only in few cases (mainly with alkoxides of Mo VI , W VI , and Nb V ) [55]. A new application was recently found in the synthesis of mixed metal oxide nanoparticles [56,57].…”

Section: ≡M-h + R-o-m≡ → ≡M-o-m≡ + Rh (9)mentioning

confidence: 99%

The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

et al. 2017

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This review is devoted to non-hydrolytic sol-gel chemistry. During the last 25 years, non-hydrolytic sol-gel (NHSG) techniques were found to be attractive and versatile methods for the preparation of oxide materials. Compared to conventional hydrolytic approaches, the NHSG route allows reaction control at the atomic scale resulting in homogeneous and well defined products. Due to these features and the ability to design specific materials, the products of NHSG reactions have been used in many fields of application. The aim of this review is to present an overview of NHSG research in recent years with an emphasis on the syntheses of mixed oxides, silicates and phosphates. The first part of the review highlights well known condensation reactions with some deeper insights into their mechanism and also presents novel condensation reactions established in NHSG chemistry in recent years. In the second section we discuss porosity control and novel compositions of selected materials. In the last part, the applications of NHSG derived materials as heterogeneous catalysts and supports, luminescent materials and electrode materials in Li-ion batteries are described.

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Preparation of TeO2 based thin films by nonhydrolytic sol–gel process

Cited by 30 publications

References 35 publications

Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

Mechanistic insight into the non-hydrolytic sol–gel process of tellurite glass films to attain a high transmission

Propane Ammoxidation Over the Mo–V–Te–Nb–O M1 Phase: Reactivity of Surface Cations in Hydrogen Abstraction Steps

The Power of Non-Hydrolytic Sol-Gel Chemistry: A Review

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