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1.
Only a small amount (≤3.5 mol%) of Ge can be doped in Ga 2O 3, Ga 1.4In 0.6O 3 and In 2O 3 by means of solid state reactions at 1400 °C. All these samples are optically transparent in the visible range, but Ge-doped Ga 2O 3 and Ga 1.4In 0.6O 3 are insulating. Only Ge-doped In 2O 3 exhibits a significant decrease in resistivity, the resistivity decreasing further on thermal quenching and H 2 reduction. The resistivity of 2.7% Ge-doped In 2O 3 after H 2 reduction shows a metallic behavior, and a resistivity of ~1 mΩ cm at room temperature, comparable to that of Sn-doped In 2O 3. 相似文献
2.
In 2O 3 is introduced into TiO 2 by sol-gel method to improve the response/recovery rate and expand the operating temperature, when the In 2O 3-TiO 2 mixed system is exposed to H 2/O 2. The sensor is fabricated by thick film technology. Influence of In 2O 3 on the film phase composition, microstructure and sensing characteristics is discussed. Dynamic response properties show that the operating temperature of the mixed system is at 500-800 °C, which is about 600-800 °C for pure TiO 2. Response time of the sensor is about 200-260 ms (millisecond) while recovery time is in a narrow range of 60-280 ms at 600-800 °C. The promoting mechanism is suggested to arise from the introduction of In 2O 3 and grain size effect of the sensing film. Then In 2O 3-TiO 2 thick films are surface-modified by Pt using chloroplatinic acid. The promoting effect of Pt dispersed on the mixed system is also investigated. 相似文献
3.
This study focuses on the influence of loading MWCNTs in In2O3-based DSSCs. In2O3-MWCNTs were prepared by sol-gel method via spin coating technique and annealed at 450 °C. The structural, morphology, and electrical properties of the photoanodes were characterized by means of XRD, AFM and FESEM, and J-V curve measurement and EIS properties, respectively. Incorporation of MWCNTs in In2O3 improved the J
sc
and V
oc
of the cell. However, excess loading of MWCNTs in In2O3 caused a serious aggregation of MWCNTs that increased the recombination rate. Thus, In2O3-MWCNTs with 0.3 % of MWCNTs achieved the highest PCE of 1.23 % with large surface area for efficient dye adsorption. Moreover, In2O3-MWCNTs(0.3%) exhibited large D
eff about 25.7 × 10−3 cm2 s−1 with low recombination effect that increased the PCE. This study suggests an optimum MWCNT incorporation of 0.3 % in the photoanode by sol-gel synthesis method of developing In2O3-based nanocomposite. 相似文献
4.
Mo-doped In 2O 3 thin films have been prepared on glass substrates using an activated reactive evaporation method and systematically studied the effect of oxygen partial pressure on the structural, optical, electrical and photoluminescence properties of the films. The obtained films are highly transparent and conductive. The films exhibited the lowest electrical resistivity of 5.2 × 10 −4 Ω cm, with an average optical transmittance of 90% in the visible region. An intensive photoluminescence emission peaks were observed at 415 and 440 nm. 相似文献
5.
In 2O 3 nanowires functionalized with Fe 2O 3 nanoparticles were synthesized by the thermal evaporation of In 2S 3 powders in an oxidizing atmosphere followed by the solvothermal deposition of Fe 2O 3 and their acetone gas sensing properties were examined. The pristine and Fe 2O 3-functionalized In 2O 3 nanowires exhibited responses of 141–390% and 298–960%, respectively, to 10–500 ppm acetone at 200 °C. The Fe 2O 3-functionalized In 2O 3 nanowire sensor showed stronger electrical response to acetone gas at 200 °C than the pristine In 2O 3 nanowire counterpart. The former showed more rapid response but slower recovery than the latter. Both the pristine and Fe 2O 3-functionalized In 2O 3 nanowire sensors showed the strongest response to acetone gas at 200 °C. The underlying mechanism for the enhanced sensing performance of the Fe 2O 3-functionalized In 2O 3 nanowire sensor towards acetone gas is discussed. 相似文献
6.
The novel two-dimensional (2-D) Ga-doped In 2O 3 nanoleaves are synthesized by a simple one-step carbonthermal evaporation method using Cu–Sn alloy as the substrates. Two basic parts construct this leaf-like nanostructure: a long central trunk and two tapered nanoribbons in symmetric distribution in relation to the trunk. The Ga–In–O alloy particles are located at or close to the tips of the central trunks and serve as catalysts for the central trunk growth by the self-catalytic vapor–liquid–solid (VLS) mechanism. And the homoepitaxial growth of tapered nanoribbon on the surface of the central trunk can be explained by vapor–solid (VS) mechanism. The room-temperature photoluminescence (PL) measurement of this nanoscaled Ga-doped In 2O 3 transparent conducting oxide (TCO) detected two blue peaks located at 432 nm and 481 nm, respectively, which can be used by Ru-based dye and indicates potential application in dye-sensitized solar cells (DSSCs). The successful preparation of this novel 2-D Ga-doped In 2O 3 nanoleaves not only enriches the synthesis of TCO materials, but also provides new blocks in future architecture of functional nano-devices. 相似文献
7.
Green-emitting Y 2SiO 5:Tb phosphor particles with fine size, spherical shape, filled morphology, high crystallinity, and good brightness were synthesized by a spray pyrolysis process. The effect of silicon precursor type on the morphology, crystal structure, crystallinity, and photoluminescence efficiency of Y 2SiO 5:Tb phosphor particles was investigated. The particles prepared from an artificial colloidal solution obtained by dispersing fumed silica particles had a pure monoclinic X2 crystalline phase, which is more appropriate for application to displays, after post-treatment at 1300 °C. On the other hand, the particles prepared from 100% tetraethyl orthosilicate (TEOS) reagent had an X2 phase and small amounts of X1 and impurity phases such as Y 2Si 2O 7 and Y 4.67Si 3O 13 due to the phase-segregation characteristics of the TEOS precursor. The photoluminescence characteristics of Y 2SiO 5:Tb phosphor particles were strongly affected by the silicon source used. The photoluminescence intensities increased with the fumed silica/TEOS ratio. The particles prepared from 100% fumed silica showed the maximum photoluminescence intensity, which is 22% higher than that of particles prepared from 100% TEOS. PACS 81.20.Rg; 78.55.Hx; 78.40.Ha; 81.05.Hd; 81.40.Tv 相似文献
8.
Ordered and perpendicular columnar arrays of In 2O 3 were synthesized on conducting ITO electrode by a simple glancing angle deposition (GLAD) technique. The as-deposited In 2O 3 columns were investigated by field emission gun-scanning electron microscope (FEG-SEM). The average length and diameter of the columns were estimated ~400 nm and ~100 nm, respectively. The morphology of the structure was examined by transmission electron microscopy (TEM). X-ray diffraction (XRD) analysis shows the polycrystalline nature of the sample which was verified by selective area electron diffraction (SAED) analysis. The growth mechanism and optical properties of the columns were also discussed. Optical absorption shows that In 2O 3 columns have a high band to band transition at ~3.75 eV. The ultraviolet and green emissions were obtained from the In 2O 3 columnar arrays. The P-N junction was formed between In 2O 3 and P-type Si substrate. The GLAD synthesized In 2O 3 film exhibits low current conduction compared to In 2O 3 TF. However, the Si/GLAD-In 2O 3 detector shows ~1.5 times enhanced photoresponsivity than that of Si/In 2O 3 TF. 相似文献
9.
SnO 2-core/In 2O 3-shell nanobelts were fabricated by a two-step process comprising thermal evaporation of Sn powders and sputter-deposition of In 2O 3. Transmission electron microscopy and X-ray diffraction analyses revealed that the core of a typical core–shell nanobelt comprised a simple tetragonal-structured single crystal SnO 2 and that the shell comprised an amorphous In 2O 3. Multiple networked SnO 2-core/In 2O 3-shell nanobelt sensors showed the response of 5.35% at a NO 2 concentration of 10 ppm at 300 °C. This response value is more than three times larger than that of bare-SnO 2 nanobelt sensors at the same NO 2 concentration. The enhancement in the sensitivity of SnO 2 nanobelts to NO 2 gas by sheathing the nanobelts with In 2O 3 can be accounted for by the modulation of electron transport by the In 2O 3–In 2O 3 homojunction. 相似文献
10.
Core-shell structured ZnO/In 2O 3 composites were successfully synthesized via situ growth method. Phase structure, morphology, microstructure and property of the products were investigated by X-ray diffraction (XRD), TG-DTA, field emission scanning electron microscopy (FESEM), energy-dispersive spectrometry (EDS), transmission electron microscope (TEM) and photoluminescence (PL). Results show that the core-shell structures consist of spindle-like ZnO with about 800 nm in length and 200 nm in diameter, and In 2O 3 particles with a diameter of 50 nm coated on the surface of ZnO uniformly. HMTA plays an important role in the formation of core-shell structures and the addition of In 2O 3 has a great effect on PL spectrum. Possible mechanism for the formation of core-shell structures is also proposed in this paper. 相似文献
11.
This paper reports the facile synthesis of In 2O 3-capped Zn-doped Fe 2O 3 nanorods along with their ethanol gas sensing properties. A two-stage process involving thermal oxidation of Fe foils and Zn powders in air and the sputter-deposition of In 2O 3 was used to synthesize these nanostructures. The nanorods synthesized using this method were ∼5 μm in length and 50–120 nm in diameter with a shell layer thickness of 10–15 nm. The multiple-networked In 2O 3-capped Zn-doped Fe 2O 3 nanorod sensor showed a significantly enhanced and ultrafast response to ethanol gas. The enhanced sensing performance was explained by modulation of the potential barrier height and the strong catalytic activity of In 2O 3 for ethanol oxidation. 相似文献
12.
InP nanoparticles (NPs) in the size range of 1.5-3 nm were synthesized using colloidal chemistry methods. Exposure of these NPs to air resulted in rapid oxidation, as shown by transmission electron microscopy. Diffraction and spectroscopic measurements confirmed the formation of In 2O 3. Similar behavior was observed for commercial InP NPs, even when capped with a ZnS shell. Photoluminescence studies suggest that the oxidation occurs even while InP NPs are still dispersed in hexane, albeit at a much slower rate. 相似文献
13.
Pulsed laser ablation in a liquid phase was successfully employed to synthesize a barium molybdate (BaMoO 4) nanocolloidal suspension. The nanocolloidal suspension was composed of well-dispersed and horizontally assembled BaMoO 4 aggregates. The BaMoO 4 aggregates showed predominantly elliptically shaped nanorods with sizes between 100 and 200 nm. The preferential elliptical
growth was rationalized from the viewpoint of the intrinsic structure of BaMoO 4. The optical properties of the prepared BaMoO 4 colloidal nanoparticles were investigated using Raman spectroscopy, UV–vis spectroscopy and photoluminescence (PL) spectrophotometry.
The optical band gap was estimated by Tauc and Menth’s law. The PL emission feature was decomposed into several individual
Gaussian components, which could be interpreted by a Jahn–Teller splitting effect on the [MoO 4] 2- tetrahedron of the BaMoO 4 colloidal nanoparticles.
PACS 42.62.-b; 82.70.Dd; 78.55.Hx; 81.07.Wx 相似文献
14.
CdS quantum dot (Qd)-sensitized TiO 2 nanotube array photoelectrode is synthesised via a two-step method on tin-doped In 2O 3-coated (ITO) glass substrate. TiO 2 nanotube arrays are prepared in the ethylene glycol electrolyte solution by anodizing titanium films which are deposited
on ITO glass substrate by radio frequency sputtering. Then, the CdS Qds are deposited on the nanotubes by successive ionic
layer adsorption and reaction technique. The resulting nanotube arrays are characterized by scanning electron microscopy,
X-ray diffraction (XRD) and UV–visible absorption spectroscopy. The length of the obtained nanotubes reaches 1.60 μm and their
inner diameter and wall thickness are around 90 and 20 nm, respectively. The XRD results show that the as-prepared TiO 2 nanotubes array is amorphous, which are converted to anatase TiO 2 after annealed at 450 °C for 2 h. The CdS Qds deposited on the TiO 2 nanotubes shift the absorption edge of TiO 2 from 388 to 494 nm. The results show that the CdS-sensitized TiO 2 nanotubes array film can be used as the photoelectrode for solar cells. 相似文献
15.
A memory device with In 2O 3 nanocrystals embedded in a biphenyl-tertracarboxylic dianhydride-phenylen diamine (BPDA-PDA) polyimide layer on a ZnO layer
was fabricated, and its electrical properties were evaluated. Then, the transmittance efficiency in the structure of the BPDA-PDA
polyimide/In 2O 3 nanocrystals/ZnO/ITO/double polishing sapphire substrate was measured to be about 80% between 440 to 800 nm by ultraviolet-visible
transmittance spectroscopy. A bipolar switching current bistability by difference resistance appeared in the sweep voltage
rage from −7 to 7 V. It was considered that the bipolar behavior of current-voltage may originate from a resistance fluctuation
because of the electron charging effect in In 2O 3 nanocrystals by voltage sweeping, Fowler–Nordheim tunneling, space-charge-limited current, and the migration of O 2− ions. 相似文献
16.
Observation of room temperature ferromagnetism in Fe doped In 2O 3 samples (In 1−xFe x) 2O 3 (0 ⩽ x ⩽ 0.07) prepared by co-precipitation technique is reported. Lattice parameter obtained from powder X software shows distinct shrinkage of the lattice constant indicating an actual incorporation of Fe ions into the In 2O 3 lattice. X-ray diffraction data measurements show that the entire sample exhibits single phase polycrystalline behavior. SEM micrographs showed the prepared powder was in the range 25–36 nm. SEM EDS mapping showed the presence of Fe and In ions in the Fe doped In 2O 3 sample. The highest remanence magnetization moment (6.624 × 10 −4 emu/g) is reached in the sample with x = 0.03. 相似文献
17.
We study in detail the potential energy surface of Ga and Sr substituted Ba 2In 2O 5 by considering the changes in the relative energies of the local structures of Ba 2In 2O 5 when replacing 1 / 8th of the indium atoms with gallium or 1 / 8th of the barium atoms with strontium. The calculations are subsequently used to interpret the increase in ionic conductivity of cubic Ba 2In 2O 5 when strontium is substituted for barium and the decrease in ionic conductivity when gallium is substituted for indium. The effects of replacing 1 / 8th of the indium atoms with gallium or 1 / 8th of the barium atoms with strontium are significant and affect considerably the relative stability of the different low energy local structures present for Ba 2In 2O 5. While a higher density of low energy structures is observed for Ba 1.75Sr 0.25In 2O 5 than for Ba 2In 2O 5, the opposite occurs for Ba 2In 1.75Ga 0.25O 5. This observation supports our main hypothesis: a high density of low energy local structures is a prerequisite for high ionic conductivity. 相似文献
18.
(CdO) 1?x–(InO 3/2) x thin films were deposited on glass substrates by the sol–gel method. The precursor solutions for the mixed oxide films were obtained from the mixture of the precursor solutions for CdO and In 2O 3 prepared separately. The investigated In atomic concentrations in the solution, x, were 0.0, 0.16, 0.33, 0.50, 0.67, 0.84, and 1. X-ray diffraction measurements showed that the films were mainly constituted of CdO, In 2O 3, and CdIn 2O 4. CdO and In 2O 3 were obtained for x=0 and 1, respectively. For x=0.67, which is the stoichiometric composition of the CdIn 2O 4 compound, only this oxide was formed. CdO and CdIn 2O 4 crystals were obtained in the Cd-rich region, whereas In 2O 3 and CdIn 2O 4 crystals were formed in the In-rich region. The PL spectra at 15 K for CdO showed the presence of two main emission bands at energies close to 2.2 and 3.0 eV. A blue-shift of these bands took place for increasing In concentration, which is related to the increase in the band gap energy of the mixed system in going from CdO, with a band gap energy of 2.46 eV, to CdIn 2O 4, with 3.2 eV, to In 2O 3, with 3.6 eV. 相似文献
19.
Ni-based cermets were prepared and reduced from mixtures of NiO and Ba 2In 0.6Ti 1.4O 5.7□ 0.3. A cermet containing 18.7 vol.% of Ni exhibits promising characteristics: 40% of open porosity and a lower DC resistivity than a Ni/YSZ cermet with a larger Ni content (30 vol.%). Its thermal expansion coefficient is 11.4 × 10 − 6 K − 1 whereas that measured for Ba 2In 0.6Ti 1.4O 5.7□ 0.3 is 9.9 × 10 − 6 K − 1. Electrical measurements vs. the Ni content have shown that the percolation threshold corresponds to 15.7 vol.% of Ni. By using saccharose as a pore former, the porosity of the electrode can be tuned. It is shown that the pore size is controlled by the particle size distribution of the pore former. 相似文献
20.
In this work, solution-processed indium oxide (In 2O 3) thin film transistors (TFTs) were fabricated by a two-step annealing method. The influence of post-metal annealing (PMA) temperatures on the electrical performance and stability is studied. With the increase of PMA temperatures, the on-state current and off-state current ( Ion/ Ioff) ratio is improved and the sub-threshold swing ( SS) decreased. Moreover, the stability of In 2O 3 TFTs is also improved. In all, In 2O 3 TFT with post-metal annealing temperature of 350°С exhibits the best performance (a threshold voltage of 4.75 V, a mobility of 13.8 cm 2/V, an Ion/Ioff ratio of 1.8 × 10 6, and a SS of 0.76 V/decade). Meanwhile, the stability under temperature stress (TBS) and positive bias stress (PBS) also show a good improvement. It shows that the PMA treatment can effectively suppress the interface trap and bulk trap and result in an obviously improvement of the In 2O 3 TFTs performance. 相似文献
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