Raman spectroscopy study of ZnO-based ceramic films fabricated by novel sol–gel process

Huang, Yanqiu; Liu, Meidong; Li, Zhen; Zeng, Yu; Liu, Shaobo

doi:10.1016/s0921-5107(02)00396-3

Cited by 238 publications

(110 citation statements)

References 13 publications

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“…The three bands of SnO 2 observed in the Raman data are associated with the E g (476 cm´1), A 1g (633 cm´1) and B 2g (774 cm´1) vibrational modes. The Raman bands of the ZnO sample were in agreement with a wurtzite hexagonal structure [30][31][32]. The Raman data showed the presence of both metal oxides within the mixed metal oxide materials, giving evidence of the composite nature of the mixtures.…”

Section: Raman Spectroscopysupporting

confidence: 52%

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

2016

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Abstract:A composite metal oxide semiconductor (MOS) sensor array based on tin dioxide (SNO 2 ) and zinc oxide (ZnO) has been fabricated using a straight forward mechanical mixing method. The array was characterized using X-ray photoelectron spectroscopy, scanning electron microscopy, Raman spectroscopy and X-ray diffraction. The array was evaluated against a number of environmentally important reducing and oxidizing gases across a range of operating temperatures (300-500˝C). The highest response achieved was against 100 ppm ethanol by the 50 wt% ZnO-50 wt% SnO 2 device, which exhibited a response of 109.1, a 4.5-fold increase with respect to the pure SnO 2 counterpart (which displayed a response of 24.4) and a 12.3-fold enhancement with respect to the pure ZnO counterpart (which was associated with a response of 8.9), towards the same concentration of the analyte. Cross sensitivity studies were also carried out against a variety of reducing gases at an operating temperature of 300˝C. The sensors array showed selectivity towards ethanol. The enhanced behaviour of the mixed oxide materials was influenced by junction effects, composition, the packing structure and the device microstructure. The results show that it is possible to tune the sensitivity and selectivity of a composite sensor, through a simple change in the composition of the composite.

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Section: Raman Spectroscopysupporting

confidence: 52%

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

2016

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“…Therefore, ZnO is an important material for room temperature UV lasers and short-wavelength optoelectronic device 1,2 . Furthermore, ZnO with its good electrical and optical properties can be used in many applications such as photoconductors, integrated sensors and transparent conducting oxide electrodes 3,4 . Up to now, a number of chemical routes have been used to synthesize nanocrystalline ZnO powders such as hydrothermal method 5 , spray pyrolysis 6 and sol-gel method 7 .…”

Section: Introductionmentioning

confidence: 99%

Untitled

Suwanboon¹

2008

ScienceAsia

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Nanocrystalline ZnO powders have been synthesized by using zinc acetate dihydrate and polyvinylpyrrolidone (PVP) as starting materials. The calcined powders in air at 600 o C for 1 hour have been characterized by XRD, indicating the wurtzite or hexagonal structure with crystallite size of about 45 nm. The TEM image gives the grain size of about 100 nm in diameter at 3x10 -4 M PVP. The morphology of ZnO powders has been changed from platelet-like to rod shape with increase in PVP concentrations. The calcined ZnO powders have exhibited the direct optical band gap of about 3.222-3.237 eV and its photoluminescence has performed the UV emission peak at about 390 nm with small blue shift due to smaller grain size at higher PVP concentrations.

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“…The Raman spectrum of 1 wt% Pr doped film presents two intense Raman bands at 581and 645 cm [55,56]. Therefore the blue shift in the ) ( 2 high E frequency with respect to the bulk value of 437 cm −1 indicates the presence of compressivestress in the films.…”

Section: Resultsmentioning

confidence: 97%

Influence of Pr Doping on the Structural, Morphological, Optical, Luminescent and Non-linear Optical Properties of RF-Sputtered ZnO Films

Sreedharan

Vinodkumar

Navas

et al. 2015

JOM

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Raman spectroscopy study of ZnO-based ceramic films fabricated by novel sol–gel process

Cited by 238 publications

References 13 publications

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

Untitled

Influence of Pr Doping on the Structural, Morphological, Optical, Luminescent and Non-linear Optical Properties of RF-Sputtered ZnO Films

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