Effect of carbon doping on gas sensing properties of molybdenum oxide nanoneedles

Wisitsoraat, Anurat; Phokharatkul, Ditsayut; Tuantranont, Adisorn; Saikaew, Charnnarong; Oros, C.; Limsuwan, Pichet

doi:10.1109/icsens.2009.5398152

Cited by 3 publications

(5 citation statements)

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“…58 The system measured the voltages (U) loaded on the resistor R 0 , and the resistances (R) of the a-MoO 3 sensors can therefore be calculated according to eqn (2). For the reducing gases and n-type semiconducting a-MoO 3 sensors, the sensitivity (S r ) is defined as eqn (3), where R a and R g are the resistances of the a-MoO 3 sensor in ambient air and in ambient gases, respectively. The response time (T res ) is defined as the time required for the sensor to reach 90% of the stabilized value of its resistance in the presence of the test gas.…”

Section: Measurement Of Gas Sensing Properties Of Molybdenum Trioxide...mentioning

confidence: 99%

“…Molybdenum trioxides (MoO 3 ) are important transition metal oxide semiconductors with unique functional properties. 1 Nanostructured MoO 3 materials have been intensively investigated and applied in smart windows, 2 gas sensors, [3][4][5][6] catalysts, [7][8][9][10] Li-ions batteries, [11][12][13][14][15][16] capacitors 17 and field emission devices. 18,19 There are basically two polytypic phases for MoO 3 : one is the thermodynamically stable orthorhombic MoO 3 (a-MoO 3 ) phase, an n-type semiconductor with a wide band gap of 3.2 eV, 20 and the other is the metastable monoclinic MoO 3 (b-MoO 3 ) phase with a ReO 3 -type structure.…”

Section: Introductionmentioning

confidence: 99%

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Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

et al. 2011

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Molybdate-based inorganic-organic hybrid disks with a highly ordered layered structure were synthesized via an acid-base reaction of white molybdic acid (MoO 3 $H 2 O) with n-octylamine (C 8 H 17 NH 2 ) in ethanol at room temperature. The thermal treatment of the as-obtained molybdatebased inorganic-organic hybrid disks at 550 C in air led to formation of orthorhombic a-MoO 3 nanoplates. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermal analysis (TG-DTA), Fourier-transform infrared (FT-IR) spectra, Raman spectra, and a laser-diffraction grain-size analyzer were used to characterize the starting materials, the intermediate hybrid precursors and the final a-MoO 3 nanoplates. The XRD, FT-IR and TG-DTA results suggested that the molybdate-based inorganic-organic hybrid compound, with a possible composition of (C 8 H 17 NH 3 ) 2 MoO 4 , was of a highly ordered lamellar structure with an interlayer distance of 2.306(1) nm, and the n-alkyl chains in the interlayer places took a double-layer arrangement with a tilt angle of 51 against the inorganic MoO 6 octahedra layers. The SEM images indicated that the molybdate-based inorganic-organic hybrids took on a well-dispersed disk-like morphology, which differed distinctly from the severely aggregated morphology of their starting MoO 3 $H 2 O powders. During the calcining process, the disk-like morphology of the hybrid compounds was well inherited into the orthorhombic a-MoO 3 nanocrystals, showing a definite plate-like shape. The a-MoO 3 nanoplates obtained were of a single-crystalline structure, with a side-length of 1-2 mm and a thickness of several nanometres, along a thickness direction of [010]. The above a-MoO 3 nanoplates were of a loose aggregating texture and high dispersibility. The chemical sensors derived from the as-obtained a-MoO 3 nanoplates showed an enhanced and selective gas-sensing performance towards ethanol vapors. The a-MoO 3 nanoplate sensors reached a high sensitivity of 44-58 for an 800 ppm ethanol vapor operating at 260-400 C, and their response times were less than 15 s.

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Section: Measurement Of Gas Sensing Properties Of Molybdenum Trioxide...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

et al. 2011

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“…Molybdenum trioxides (MoO 3 ) are important transition metaloxide with unique functional properties. [1] Nanostructured MoO 3 materials have been intensively investigated and applied in smart windows, [2] gas sensors, [3][4][5][6] catalysts, [7][8][9][10] Li-ions batteries, [11][12][13][14][15][16] capacitors [17] and field emission devices. [18,19] There are basically two polytypic phases for MoO 3 : one is the thermodynamically stable orthorhombic MoO 3 ( a-MoO3) phase, [20] and the other is the metastable monoclinic MoO 3 (β-MoO 3 ) phase with a ReO 3 -type structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Photochromic Properties of M<sub>O</sub>O<sub>3</sub> Nanosheets Crystallites

Zhang

Cui

et al. 2013

KEM

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Layered Molybdenum trioxide MOO3, with a two-dimensional (2D) structure was successfully delaminated into colloidal nanosheets in n-butanol via a soft-chemical process involving intercalation of dodecylamine. X-ray diffration (XRD) showd that: after intercalation spacing of the layered material expend to 2.69nm from 1.38nm, and Characterizations by transmission electron microscopy (TEM) and scan electron microscopy (TEM) confirmed the formation of unilamellar 2D nanosheet crystallites with an average lateral size of 400 nm. The obtained nanosheets exhibited photochromic properties upon UV-VIS excitation. The chromogenic nanosheet obtained in this study features the intense UV absorption and optically switchable Visible-to-IR absorption, which may be useful for window applications such as heat-absorbing films.

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“…Molybdenum oxide (MoO 3 ), a wide-band-gap (3.2 eV) n-type semiconductor, has attracted great attention as field emission devices (FED), , photodetectors, batteries, , catalysts, sensors, , and photochromic and electrochromic materials. , Like other metal oxide nanowires, the main applications of MoO 3 in photoelectronics are limited by its wide bandgap. Its low electrical n-type conductivity (resistivity ≈ 10 10 Ω·m) always inhibits its practical implementation as well . Impurity doping is one of the most common approach to modify the electrical properties of the material and one advantage about MoO 3 is its rich intercalation chemistry made possible by its layered structure.…”

Section: Introductionmentioning

confidence: 99%

“…Its low electrical n-type conductivity (resistivity ≈ 10 10 Ω•m) always inhibits its practical implementation as well. 26 Impurity doping is one of the most common approach to modify the electrical properties of the material and one advantage about MoO 3 is its rich intercalation chemistry made possible by its layered structure. However, due to the size limitation of the gap between layers, only small ions such as lithium have been successfully intercalated through immersing MoO 3 nanostructure in LiCl solution.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive Phototransistor Based on K-Enriched MoO₃ Single Nanowires

Sun

Zheng

et al. 2012

J. Phys. Chem. C

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An ultrasensitive phototransistor was fabricated based on K-intercalated MoO3 single nanowire. Devices with ultrafast photoresponse rate, high responsivity, and broad spectral response range were demonstrated. Detailed analysis of the charge transport in the device revealed the coexistence of both thermal-activation and photoactivation mechanisms. The promising results are expected to promote the potential of this material in nano/micro-scaled photoelectronic applications.

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Effect of carbon doping on gas sensing properties of molybdenum oxide nanoneedles

Cited by 3 publications

References 5 publications

Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

Synthesis and Photochromic Properties of M<sub>O</sub>O<sub>3</sub> Nanosheets Crystallites

Ultrasensitive Phototransistor Based on K-Enriched MoO₃ Single Nanowires

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Effect of carbon doping on gas sensing properties of molybdenum oxide nanoneedles

Cited by 3 publications

References 5 publications

Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

Single-crystalline MoO3 nanoplates: topochemical synthesis and enhanced ethanol-sensing performance

Synthesis and Photochromic Properties of M<sub>O</sub>O<sub>3</sub> Nanosheets Crystallites

Ultrasensitive Phototransistor Based on K-Enriched MoO3 Single Nanowires

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Ultrasensitive Phototransistor Based on K-Enriched MoO₃ Single Nanowires