Electrical properties of Y/Mg modified NiO simple oxides for negative temperature coefficient thermistors

He, Zhenli; Li, Zhicheng; Xiang, Qinghua; Yan, Weiqin; Zhang, Hong

doi:10.1111/ijac.13084

Cited by 20 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Al 3+ ion acts as a donor in CuO crystal, in which the weakly bound electrons can be thermally activated to jump to the conduction band and provide electronic conduction. Element doping can effectively regulate the conductivity of a semiconductor material and there is an optimized dopant content for a certain material [12][13][14][15][16][17][18]. As shown in Fig.…”

Section: Electrical Propertiesmentioning

confidence: 99%

“…To a specific NTC thermistor system, it should be of practical application value to achieve both adjustable ρ 25 and appropriate B values by element doping. Ceramics based on single oxides such as SnO 2 , NiO, CuO and vanadium oxides were studied due to their excellent NTC characteristics, and both ρ 25 and B value can be effectively adjusted by oxide doping and element substitution [12][13][14][15][16][17][18]. Copper oxide (CuO), a semiconducting material with a band gap of about 1.4 eV, is one of the widely used materials because of its unique electrical conductivity, optical/catalytic properties, chemical stability and low cost [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Wang

Yan

et al. 2020

PAC

Self Cite

View full text Add to dashboard Cite

Nb/Al-modified CuO ceramics (yNb/0.02Al-CuO, 0 ≤ y ≤ 0.07, denoted as NACO) were synthesized using sol-gel method for applications in negative temperature coefficient (NTC) thermistors. The phase structure, microstructure and electrical properties of the ceramics were investigated. XRD investigation reveals that the NACO ceramics has the main phase with monoclinic crystalline structure. The analysis of X-ray photoelectron spectroscopy proved the existence of Cu 2+ /Cu + and Nb 5+ /Nb 4+ ions. Temperature dependence of the resistivity indicated that the NACO ceramics present typical NTC characteristic. The NTC materials' constant, B value, can be adjusted from 2430 K to 3805 K by changing the Nb-concentration in the Al-doped CuO ceramics. Among four applied calibration equations the Hoge-3 equation is the most effective one for the resistancetemperature calibration of the prepared NTC thermistors. The complex impedance analysis was performed and revealed that both grain effect and grain boundary effect similarly contribute to the electrical conductive behaviour and NTC feature of the NACO ceramics. The band conduction and polaron hopping conduction are proposed as the conduction mechanisms in the NACO thermistors.

show abstract

Section: Electrical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Wang

Yan

et al. 2020

PAC

Self Cite

View full text Add to dashboard Cite

show abstract

“…They exhibit two different types of response: positive temperature coefficient of resistance (PTC) and negative temperature coefficient of resistance (NTC). Commonly employed NTC thermistors are made from oxides of nickel, − cobalt, manganese, ,, and iron. , Other oxides used to make NTC thermistors include zinc oxide , and copper oxide. , PTC thermistors are typically made from oxides of barium and strontium titanate . Temperature sensors with a wide range of temperature measurements under different humidity conditions are desirable.…”

Section: Introductionmentioning

confidence: 99%

Vanadium Dioxide-Based Miniaturized Thermal Sensors: Humidity Effects on Phase Change and Sensitivity

Elango

Kabir

Prasanna

et al. 2022

ACS Appl. Electron. Mater.

View full text Add to dashboard Cite

With rapid advancements in technology in the electronics sector, demand for the miniaturization of devices while retaining their functionality is on the rise. Metal oxidebased thermal sensors are desired, owing to their enhanced sensing capabilities and low cost of operation. Highly sensitive metal oxide sensors can enable stable, accurate, and miniaturized thermal sensors tailored to different operational ranges. However, the influence of humidity and how it affects the sensitivity of the material by interacting with the material surface has not been extensively studied. In this work, we report a vanadium dioxide (VO 2 )-based thin film thermal sensor studied under the influence of varying humidity conditions. The effect of different humidity levels on the overall thermal sensing behavior and the insulator-to-metal transition (IMT) phenomenon was investigated. Further, density functional theory (DFT) studies were conducted to understand the thermal sensing mechanism under changing humidity conditions. The developed sensor exhibited a good response over a broad temperature range of −100 to 100 °C, with a TCR of −0.00243%, high sensitivity, and cyclic repeatability. Wireless measurement capabilities were also demonstrated. Such sensors could potentially be used in environmental sensing applications.

show abstract

“…It indicates that the carrier hopping energy is reduced by the addition of Cu. In the electronic ceramics, there is a high energy barrier at the grain boundaries [58]. As the grain size increases, the number of the grain boundaries decreases, and the charge carrier hopping energy barrier decreases.…”

mentioning

confidence: 99%

Enhanced conductivity and stability of Co _0.98Cu _xMn _{2.02−
x}O ₄ ceramics with dual phases and twin structures

Ma¹,

He²,

Bi³

et al. 2023

Journal of Advanced Ceramics

View full text Add to dashboard Cite

Semiconductor materials with heterogeneous interfaces and twin structures generally demonstrate a higher concentration of carriers and better electrical stability. A variety of Cu-doped Co 0.98 Cu x Mn 2.02−x O 4 (0 ≤ x ≤ 0.5) negative temperature coefficient (NTC) ceramics with dual phases and twin structures were successfully prepared in this study. Rietveld refinement indicates that the content of a cubic spinel phase increases with increasing Cu content. The addition of Cu can promote grain growth and densification. Atomic-level structural characterization reveals the evolution of twin morphology from large lamellae with internal fine lamellae (L IT lamellae) to large lamellae without internal fine lamellae (L lamellae) and the distribution of twin boundary defects. First-principles calculations reveal that the dual phases and twin structures have lower oxygen-vacancy formation energy than those in the case of the pure tetragonal and cubic spinel, thereby enhancing the transmission of carriers. Additionally, the three-dimensional charge-density difference shows that metal ions at the interface lose electrons and dwell in high valence states, thereby enhancing electrical stability of the NTC ceramics. Furthermore, the additional Cu ions engage in electron-exchange interactions with Mn and Co ions, thereby reducing resistivity. In comparison to previous Cu-containing systems, the Co 0.98 Cu x Mn 2.02−x O 4 series exhibit superior stability (aging value ≤ 2.84%), tunable room-temperature resistivity (ρ), and material constant (B) value (17.5 Ω•cm ≤ ρ ≤ 7325 Ω•cm, 2836 K ≤ B ≤ 4315 K). These discoveries lay a foundation for designing and developing new NTC ceramics with ultra-high performance.

show abstract

Electrical properties of Y/Mg modified NiO simple oxides for negative temperature coefficient thermistors

Cited by 20 publications

References 33 publications

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Vanadium Dioxide-Based Miniaturized Thermal Sensors: Humidity Effects on Phase Change and Sensitivity

Enhanced conductivity and stability of Co _0.98Cu _xMn _{2.02−
x}O ₄ ceramics with dual phases and twin structures

Contact Info

Product

Resources

About

Electrical properties of Y/Mg modified NiO simple oxides for negative temperature coefficient thermistors

Cited by 20 publications

References 33 publications

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Electrical properties of Nb/Al-doped CuO-based ceramics for NTC thermistors

Vanadium Dioxide-Based Miniaturized Thermal Sensors: Humidity Effects on Phase Change and Sensitivity

Enhanced conductivity and stability of Co 0.98Cu x Mn 2.02− x O 4 ceramics with dual phases and twin structures

Contact Info

Product

Resources

About

Enhanced conductivity and stability of Co _0.98Cu _xMn _{2.02−
x}O ₄ ceramics with dual phases and twin structures