Synthesis of α-MoO3 Thin Sheets and Their Catalytic Behavior for Selective Oxidation of Methanol to Formaldehyde

Phúc, Nguyễn Hữu; Phuong, Pham T. T.; Tai, Vo T.; Huan, Nguyen Manh; Duy, Nguyen Phuc Hoang; Lộc, Lưu Cẩm

doi:10.1007/s10562-015-1640-2

Cited by 5 publications

(1 citation statement)

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“…Molybdenum oxide (MoO3), because of its exceptional properties, has been the subject of much revived interest as a promising candidate for a broad range of applications such as catalysis [1,2], batteries [3,4], supercapacitors [5], photo and electrochromic devices [6,7], gas sensors [8], memory devices [9], organic light emitting diodes (OLEDs) [10], Dielectric/insulation applications [11], oxide solar cells [12] , etc. MoO3 has four polymorph modifications, which include α-MoO3 (orthorhombic), β-MoO3 (monoclinic), high-pressure MoO3-II and h-MoO3 (hexagonal).…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of low-temperature sinterable α-MoO3

Varghese

Siponkoski

Nelo

et al. 2018

Journal of the European Ceramic Society

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The α-MoO3 ceramics were prepared by uniaxial pressing and sintering of MoO3 powder at 650 o C and their structure, microstructure, densification and sintering and microwave dielectric properties were investigated. The sintering temperature of α-MoO3 was optimized based on the best densification and microwave dielectric properties. After sintering at 650 o C the relative permittivity was found to be 6.6 and the quality factor was 41,000 GHz at 11.3 GHz. The full-width half-maximum of the A1g Raman mode of bulk α-MoO3 at different sintering temperatures correlated well with the Qf values. Moreover, the sintered samples showed a temperature coefficient of the resonant frequency of -25 ppm/ o C in the temperature range from -40 to 85 o C and they exhibited a very low coefficient of thermal expansion of ±4 ppm/ o C. These microwave dielectric properties of α-MoO3 will be of great benefit in future MoO3 based materials and their applications.

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