Growth and characterization of molybdenum oxide thin films prepared by photochemical metal–organic deposition (PMOD)

Buono-Core, G.E.; Cabello, G.; Klahn, A. Hugo; Lucero, Antonio T.; Núñez, Mauricio; Torrejón, B.; Castillo, Claudia

doi:10.1016/j.poly.2010.01.036

Cited by 51 publications

(22 citation statements)

References 32 publications

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“…The diffractogram of an Au/MoO 3 film with 470 nm NPs (Fig. 5a) clearly shows the presence of orthorhombic α-MoO 3 preferentially oriented along the [020] axis [55][56][57] , but no signals attributed to the gold NPs can be observed. This is likely due to a combination of factors, including the small particle size, the small grain size, and the relatively low concentrations of Au relative to MoO 3 .…”

Section: -54mentioning

confidence: 99%

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

Castillo

Buono-Core

Manzur

et al. 2016

J. Chil. Chem. Soc.

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Gold nanoparticles (AuNPs) were deposited by DC-magnetron sputtering onto molybdenum trioxide (MoO 3 ) thin films grown by Photochemical MetalOrganic Deposition (PMOD) on Si(100) and borosilicate glass substrates. The chemical, optical and morphology properties of the films were studied by UV/ Vis Spectroscopy, Scanning Electron Microscopy (SEM), X-Ray Photoelectron Spectroscopy (XPS), and X-Ray Diffraction (XRD). SEM revealed that AuNPs formed after 5 s of sputtering. AuNPs are spherical and have both an average diameter of 18 nm and a relatively narrow size distribution. As the deposition time increases, larger structures are formed by an aggregation of AuNPs. XPS studies of the AuNP/MoO 3 films on Si(100) showed the presence of Mo(VI) and Mo(V), which indicated that the films were primarily non-stoichiometric molybdenum oxides. The occurrence of oxygen vacancies in the substrate play an important role to stabilize the AuNPs. , gas sensing 11-13 and catalysis [14][15][16][17][18][19][20] . KeywordsAuNPs have been prepared using various approaches that can be divided into physical and chemical methods. Included among the chemical methods are reduction 21, photochemistry using UV irradiation 22,23 , photochemistry using X-ray irradiation 24 , sonochemistry 25,26 , and sonoelectrochemistry 27 . A physical method that can be used is cathodic deposition using magnetron sputtering. This physical method has several advantages over chemical syntheses, such as a lack of surface contamination from solvent or precursor molecules, which may be important for subsequent assays and/or applications. Furthermore, physical deposition is cheaper and faster and does not damage the environment [28][29][30] .Gold catalysts with selected support materials can efficiently promote many reactions that normally occur at much higher temperatures or with lower selectivity when catalyzed by other metals. It has been shown that AuNPs supported on metal oxides exhibit unique activity at room temperature because of a meta-stable interatomic bonding between gold atoms 31 . It has been shown that substrates such as ceria 32 , titania 33,34 and titanates 35 can stabilize AuNPs in which oxygen vacancies play an important role in the stabilizing effect. It is generally accepted that interfaces provide adequate sites for chemical reactions, and metallic Au surfaces are required as reservoirs for a determined reactant 36,37 . Gold nanoparticles also play an important role in the development of chemical and biological sensors. A sensor usually has two functional components: one component selectively binds with the analyte, and the other provides transduction of this interaction into a detectable signal 38 . Considering the chromogenic properties of molybdenum oxide on the one hand and the catalytic properties of gold nanoparticles on the other, a binary system that is formed by molybdenum oxide coated with gold nanoparticles could potentially be of use in the field of catalysis and/or in the fabrication of new specific sensors. For example, i...

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Section: -54mentioning

confidence: 99%

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

Castillo

Buono-Core

Manzur

et al. 2016

J. Chil. Chem. Soc.

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“…5,[9][10][11][12][13] It can be found in the mineral tugarinovite (named after the geochemist Alexsey Ivanovich Tugarinov) 14 and shows a metal-like electric conductivity being unusual for transition-metal oxides. 15,16 It does not have a variety of technological applications such as MoO3 but there are some interesting approaches for usage as anode material in lithium-ion batteries, 15,[17][18][19][20] films for energy storage, 21 soft-magnetic and optical materials, [22][23][24] and as nanorods. 22,25 The synthesis of other oxides with metal ions in just one oxidation state probably cannot be achieved by conventional chemical methods, like oxidation or reduction.…”

Section: Introductionmentioning

confidence: 99%

HP-MoO₂: A High-Pressure Polymorph of Molybdenum Dioxide

et al. 2017

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High-pressure molybdenum dioxide (HP-MoO2) was synthesized using a multi-anvil press at 18 GPa and 1073 K, as motivated by previous first-principles calculations. The crystal structure was determined by single-crystal X-ray diffraction. The new polymorph crystallizes isotypically to HP-WO2 in the orthorhombic crystal system in space group Pnma and was found to be diamagnetic. Theoretical investigations using structure optimization at density-functional theory (DFT) level indicate a transition pressure of 5 GPa at 0 K and identify the new compound as slightly metastable at ambient pressure with respect to the thermodynamically stable monoclinic MoO2 (α-MoO2; ΔEm = 2.2 kJ·mol -1 ).

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“…Nanometric MoO 2 has attracted great technological interest because of its interesting physicochemical properties and is applied as a catalyst [13,14], an energy storing [15], soft magnetic [16], and optical [17,18] material.…”

Section: Introductionmentioning

confidence: 99%

Photoelectrochemical properties of MoO2 thin films

Dukštienė

Sinkevičiūtė

2013

J Solid State Electrochem

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Thin MoO 2 films were electrodeposited on a selenium pre-deposited SnO 2 |glass plate. The photoelectrochemical properties of MoO 2 films were investigated in 0.1 M Na 2 SO 4 solution by the ultraviolet-visible spectrophotometry, linear sweep voltammetry, and altering current impedance measurement techniques. It was found that under illumination with the incident light of λ=366 nm, the photo response of the MoO 2 |SnO 2 |glass electrode resulted from the MoO 2 layer, while the SnO 2 layer served as a sink for photogenerated charge carriers. The MoO 2 film exhibited ntype conductivity. A schematic band structure diagram of MoO 2 in 0.1 M Na 2 SO 4 solution was constructed. The flat band potential (E fb ), the donor concentration (N D ), the photogeneration current efficiency depended on MoO 2 film thickness. The [Fe(CN) 6 ] 4−/3− redox PEC cell with MoO 2 | SnO 2 |glass plate as a photoanode was constructed. Power output characteristics such as the open circuit voltage (V OC ), short circuit current (I SC ), the fill factor (FF), and the lightto-electrical conversion efficiency (η) were determined. The maximum light-to-electrical conversion efficiency exhibited by the PEC cell was 0.94 %.

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Growth and characterization of molybdenum oxide thin films prepared by photochemical metal–organic deposition (PMOD)

Cited by 51 publications

References 32 publications

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

HP-MoO₂: A High-Pressure Polymorph of Molybdenum Dioxide

Photoelectrochemical properties of MoO2 thin films

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Growth and characterization of molybdenum oxide thin films prepared by photochemical metal–organic deposition (PMOD)

Cited by 51 publications

References 32 publications

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

Molybdenum Trioxide Thin Films Doped With Gold Nanoparticles Grown by a Sequential Methodology: Photochemical Metal-Organic Deposition (Pmod) and Dc-Magnetron Sputtering

HP-MoO2: A High-Pressure Polymorph of Molybdenum Dioxide

Photoelectrochemical properties of MoO2 thin films

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HP-MoO₂: A High-Pressure Polymorph of Molybdenum Dioxide