Thermoelectric property studies on bulk TiOx with x from 1 to 2

He, Qinyu; Hao, Qing; Chen, Gang; Poudel, Bed; Wang, Xiaowei; Wang, Dezhi; Ren, Zhifeng

doi:10.1063/1.2767775

Cited by 90 publications

(58 citation statements)

References 15 publications

(2 reference statements)

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“…The high thermoelectric current of the TiO 2 -based diode is associated with the high Seebeck coefficient of TiO 2 , which is 0.6 mV/K 30 . Figure 4b shows the thermoelectric current and chemicurrent measured on the nanoparticle/diode system.…”

Section: Au Tiox With Ptnpmentioning

confidence: 99%

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation

et al. 2008

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Hot electron flow generated on colloid platinum nanoparticles during exothermic catalytic carbon monoxide oxidation was directly detected with Au/TiO 2 diodes.Although Au/TiO 2 diodes are not catalytically active, platinum nanoparticles on Au/TiO 2 exhibit both chemicurrent and catalytic turnover rate. Hot electrons are generated on the surface of the metal nanoparticles and go over the Schottky energy barrier between Au and TiO 2 . The continuous Au layer ensures that the metal nanoparticles are electrically connected to the device. The overall thickness of the metal assembly (nanoparticles and Au thin film) is comparable to the mean free path of hot electrons, resulting inballistic transport through the metal. The chemicurrent and chemical reactivity of nanoparticles with citrate, hexadecylamine, hexadecylthiol, and TTAB (Tetradecyltrimethylammonium Bromide) capping agents were measured during catalytic CO oxidation at pressures of 100 Torr O 2 and 40 Torr CO at 373~513 K. We found that chemicurrent yield varies with each capping agent, but always decreases with increasing temperature. We suggest that this inverse temperature dependence is associated with the influence of charging effects due to the organic capping layer during hot electron transport through the metal-oxide interface.

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Section: Au Tiox With Ptnpmentioning

confidence: 99%

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation

et al. 2008

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“…[4][5][6][7] The electrical, optical, magnetic, and structural properties of bulk TiO have been widely investigated. [8][9][10][11][12][13][14][15][16][17] Especially, the superconductivity in TiO bulk materials was discovered in the early 1965s by Hulm et al 18 They reported that, for the bulk TiO with NaCl structure, its superconducting transition temperature T c increases from 0.2 to 1.0 K with oxygen content increases from 0.9 to 1.1, but is below 0.08 K outside this range. 19 Further investigations showed that highpressure annealing increases the oxygen content and lattice constant of cubic TiO bulk, and its superconducting transition temperature increases linearly with oxygen content to a maximum of 2.0 K. 4,7 However, the intrinsic superconducting properties of TiO, such as the lower and upper critical fields, superconducting coherence length and so on, are not clear yet, due to the difficulty in obtaining single crystals or epitaxial films.…”

Section: Introductionmentioning

confidence: 99%

Enhanced superconductivity in TiO epitaxial thin films

et al. 2017

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Titanium oxides have many fascinating optical and electrical properties, such as the superconductivity at 2 K in cubic titanium monoxide (TiO) polycrystalline bulk. However, the lack of TiO single crystals or epitaxial films has prevented systematic investigations on its superconductivity. Here, we report the basic superconductivity characterizations of cubic TiO films epitaxially grown on (0001)-oriented α-Al 2 O 3 substrates. The magnetic and electronic transport measurements confirmed that TiO is a type-II superconductor and the recorded high T c is about 7.4 K. The lower critical field (H c1 ) at 1.9 K, the extrapolated upper critical field H c2 (0), and coherence length are about 18 Oe, 13.7 T, and 4.9 nm, respectively. With increasing pressure, the value of T c shifts to lower temperature while the normal state resistivity increases. Our results on the superconducting TiO films confirm the strategy to achieve higher T c in the epitaxial films, which may be helpful for finding more superconducting materials in various related systems.

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“…[25][26][27][28][29] Non-stoichiometry and doping can lead to a high-ZT value because of the enhancement of the Seebeck coefficient and electrical conductivity. However, non-stoichiometric TiO x (1oxo2) materials exhibit low thermal conductivity at high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…However, non-stoichiometric TiO x (1oxo2) materials exhibit low thermal conductivity at high temperature. 26 To overcome this drawback, TiC 1-x O x solid solutions with high electrical conductivity and good thermal stability were applied as TE materials. [30][31][32] Therefore, TiC 1-x O x solid solutions are promising candidates as TE materials in the heat-to-electricity conversion field.…”

Section: Introductionmentioning

confidence: 99%

High thermoelectric performance of all-oxide heterostructures with carrier double-barrier filtering effect

Hou

Wei

et al. 2015

NPG Asia Mater

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Thermoelectric materials can realize significant energy savings by generating electricity from untapped waste heat; however, the coupling of the thermoelectric parameters unfortunately limits their efficiency and practical applications. Herein, rational all-oxide TiC 1-x O x @TiO y -TiO 2 (xo1, 1oyo2) heterostructures with significantly enhanced thermoelectric properties have been designed, and a high dimensionless figure of merit (ZT) value of up to 0.84 at 973 K was achieved in the all-oxide TiC 0.1 O 0.9 @TiO y -TiO 2 heterostructures, which is one of the highest values in n-type oxide bulk thermoelectric materials to date. The TiC 1-x O x @TiO y heterostructures, which include a thin film of approximately 5-10 nm on the surface of TiC 1-x O x compounds prepared by a facile anodization process, exhibit an obvious improvement of the thermoelectric power factor. Furthermore, an excellent dimensionless figure of merit value was obtained in the TiC 1-x O x @TiO y -TiO 2 heterostructures prepared by the anodization process assisted by the sol-gel chemical route, which can be attributed to the decrease in the carrier concentration via the carrier double-barrier filtering effect. This work develops a facile strategy for synthesizing core-shell heterostructures and demonstrates their superior ability to optimize thermoelectric energy harvesting.

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Thermoelectric property studies on bulk TiOx with x from 1 to 2

Abstract: Effect of ceramic dispersion on thermoelectric properties of nano-ZrO 2 ∕ CoSb 3 composites

Cited by 90 publications

References 15 publications

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation

Enhanced superconductivity in TiO epitaxial thin films

High thermoelectric performance of all-oxide heterostructures with carrier double-barrier filtering effect

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Thermoelectric property studies on bulk TiOx with x from 1 to 2

Abstract: Effect of ceramic dispersion on thermoelectric properties of nano-ZrO 2 ∕ CoSb 3 composites

Cited by 90 publications

References 15 publications

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO2Schottky Diodes during Catalytic CO Oxidation

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO2Schottky Diodes during Catalytic CO Oxidation

Enhanced superconductivity in TiO epitaxial thin films

High thermoelectric performance of all-oxide heterostructures with carrier double-barrier filtering effect

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Product

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Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation

Probing Hot Electron Flow Generated on Pt Nanoparticles with Au/TiO₂Schottky Diodes during Catalytic CO Oxidation