Construction of three-dimensional flower-like α-MoO3 with hierarchical structure for highly selective triethylamine sensor

Sui, Lili; Xu, Yingming; Zhang, Xianfa; Cheng, Xiaoli; Gao, Shan; Zhao, Hui; Cai, Zhuang; Huo, Li‐Hua

doi:10.1016/j.snb.2014.10.138

Cited by 218 publications

(74 citation statements)

References 48 publications

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“…Chithambararaj and Bose [19] has prepared h-MoO 3 and a-MoO 3 nanoparticles by a hydrothermal method. To our best knowledge, the studies of MoO 3 properties are mainly concentrated on the gas sensing performance, [2,10,18,20] lithium-ion batteries, [3,6,9,12] field emission [1,5,21] photochromic property. [4,8,22] There have been few reports on the study of photocatalytic performance of MoO 3 for degrading organic dye.…”

Section: Introductionmentioning

confidence: 99%

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Deng

et al. 2015

Journal of Experimental Nanoscience

142

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Metastable h-MoO 3 hexagonal prisms have been fabricated through a simple green ultrasonic-assisted chemical route. After calcination at 440 C for 2 h, the thermodynamically stable a-MoO 3 nanoplate-based rods have been achieved through a process of in situ phase transformation. The as-synthesised products have been characterised by powder X-ray diffraction, field emission scanning electron microscopy, Fourier transform infrared spectrum, UVÀvis diffuse reflection spectroscopy and photoluminescence spectroscopy. The phase transformation from metastable h-MoO 3 to stable a-MoO 3 is observed at 419 C according to the differential scanning calorimetry results. The possible growth mechanism of MoO 3 crystals has been proposed based on the experimental results. The prepared two kinds of MoO 3 samples both display higher photocatalytic performance for degrading rhodamine B compared to that of commercial MoO 3 . In the present system, a-MoO 3 nanoplate-based rods exhibit slightly higher degradation activity than h-MoO 3 hexagonal prisms, which is possibly due to its smaller band gap energy, smaller scale of nanoplate, better adsorption capacity and lower recombination of photogenerated electrons and holes.

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Section: Introductionmentioning

confidence: 99%

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Deng

et al. 2015

Journal of Experimental Nanoscience

142

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“…In particular, MoO 3 nanostructures, such as MoO 3 nanobelts, flower-like microstructured MoO 3 , and net-like MoO 3 porous architectures synthesized by the hydrothermal route, exhibit appealing sensing properties for VOC vapors. [25][26][27] The gas sensing properties of MoO 3 thin film fabricated by radiofrequency (RF) sputtering have also been investigated. [28] These reports showed the nanostructures possessed typical sensing performance for VOC vapors; however, these nanostructures need to be processed with two or more steps, which is time consuming.…”

mentioning

confidence: 99%

Diverse Adsorption/Desorption Abilities Originating from the Nanostructural Morphology of VOC Gas Sensing Devices Based on Molybdenum Trioxide Nanorod Arrays

Cong

Sugahara

Wei

et al. 2016

Adv Materials Inter

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attention from researchers because of their advantages of sensitivity, rapid response, and inexpensive production. [9,10] Recently, considerable effort has been devoted to developing much simpler routes to control the shape and grain size of SMO to achieve a higher surface-to-area ratio and unique surface chemistry behavior to improve sensing performance. [11][12][13] Among the metal oxides, molybdenum trioxide (MoO 3 ) is one of the most desirable for use in gas sensors because of its indirect wide band gap of 3.5 eV. [14][15][16][17] MoO 3 -based gas analyzing devices show excellent gas sensing properties for several kinds of gas species [18][19][20][21][22][23][24] because of their special quantum size effect, surface effect, high reactivity, and the polyvalency of molybdate. In particular, MoO 3 nanostructures, such as MoO 3 nanobelts, flower-like microstructured MoO 3 , and net-like MoO 3 porous architectures synthesized by the hydrothermal route, exhibit appealing sensing properties for VOC vapors. [25][26][27] The gas sensing properties of MoO 3 thin film fabricated by radiofrequency (RF) sputtering have also been investigated. [28] These reports showed the nanostructures possessed typical sensing performance for VOC vapors; however, these nanostructures need to be processed with two or more steps, which is time consuming. For instance, these nanostructures need to be transferred or arranged on a ceramic substrate and then annealed to obtain substantial growth/adhesion on the substrate. To increase the VOC gas sensing performance of nanostructures, they needed to be loaded with noble metal particles (e.g., Au, Nanorod arrays gas sensors are attracting much scientific and engineering interest because of their excellent sensing performance arising from their unique nanostructures. In this work, large-scale random 3D networks of ultrafine single-crystal α-MoO 3 nanorod arrays are applied as gas sensors. The arrays are spontaneously grown by a simple single-step solution route. A prompt response and obvious discrimination of ethanol, methanol, isopropanol, and acetone vapors at 573 K are investigated via the modulation of the resistance of the gas sensors. The sensitivity, response time, and recovery time of the sensors strongly depend on the specific morphologies of the nanorod arrays, such as length, number, and coverage of nanorods in the 3D network. A reaction mechanism in which the 3D-network nanorod arrays adsorb and react with the target molecules more readily than the seed layer is proposed to explain the different response and recovery times of the sensors. These random 3D-network nanorod arrays with functionally tunable morphology are promising for universal application as gas sensors for detecting various vapors, and provide valuable insights for the production of fast, largescale, low-cost, and simple synthesis of sensing devices.

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“…Figure 6d shows SAED pattern of α-MoO 3 . The distinct bright rings pattern indicates polycrystalline nature of α-MoO 3 [37].…”

Section: Morphological Analysismentioning

confidence: 95%

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

Desai¹,

Mali²,

Kondalkar³

et al. 2015

J Nanomed Nanotechnol

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In the present investigation, sea urchin like morphology of h-MoO 3 nanorods are successfully synthesized by chemical bath deposition (CBD) technique. The thermal stability, structural details, morphology and compositional analysis of MoO 3 was done using thermogravimetry (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) techniques respectively. The thermal analysis reveals presence of sharp exothermic peak at 409ºC indicating irreversible phase transition. X-ray diffraction pattern showed hexagonal to orthorhombic phase transition after annealing at 450ºC. As synthesized h-MoO 3 shows well oriented hexagonal rods with sea urchin like architecture while that of annealed MoO 3 sample revealed 2D layer by layer growth. The SAED pattern confirms single crystalline nature of as synthesized h-MoO 3 and polycrystalline nature of annealed α-MoO 3 . While XPS study of both confirms Mo +6 and O 2-oxidation states of elements. Furthermore, characteristic antibacterial properties of h-MoO 3 and α-MoO 3 against gram positive Bacillus megaterium, Streptococcus aureus and gram negative Escherichia coli is noted.

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Construction of three-dimensional flower-like α-MoO3 with hierarchical structure for highly selective triethylamine sensor

Cited by 218 publications

References 48 publications

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Diverse Adsorption/Desorption Abilities Originating from the Nanostructural Morphology of VOC Gas Sensing Devices Based on Molybdenum Trioxide Nanorod Arrays

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

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Construction of three-dimensional flower-like α-MoO3 with hierarchical structure for highly selective triethylamine sensor

Cited by 218 publications

References 48 publications

Metastableh-MoO3and stableα-MoO3microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO3and stableα-MoO3microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Diverse Adsorption/Desorption Abilities Originating from the Nanostructural Morphology of VOC Gas Sensing Devices Based on Molybdenum Trioxide Nanorod Arrays

Chemically Grown MoO3 Nanorods for Antibacterial Activity Study

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Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity

Metastableh-MoO₃and stableα-MoO₃microstructures: controllable synthesis, growth mechanism and their enhanced photocatalytic activity