Thermally-induced optical property changes of sputtered PdOx films

Arai, Tomofumi; Shima, Takayuki; Nakano, Takashi; Tominaga, Junji

doi:10.1016/j.tsf.2006.11.040

Cited by 25 publications

(17 citation statements)

References 37 publications

(48 reference statements)

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“…This value is similar to the reported value. 12 Another component at higher binding energy at 537.3 eV corresponds to adsorbed oxygen species on the PdO surface.Depending on crystallinity and purity, reported band gap of PdO has a wide range which varies from 0.8 to 2.2 eV 28,31,32. Nanocrystalline PdO thin film is further characterized by UV-vis and specular reflectance UV-vis spectroscopy to estimate the band gap energy.Figure 4ashows the absorption spectra of as-deposited LB film and PdO thin film.…”

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confidence: 99%

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing

Choudhury

Betty

Bhattacharyya

et al. 2016

ACS Appl. Mater. Interfaces

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Nanoparticulate thin films of PdO were prepared using the Langmuir-Blodgett (LB) technique by thermal decomposition of a multilayer film of octadecylamine (ODA)-chloropalladate complex. The stable complex formation of ODA with chloropalladate ions (present in subphase) at the air-water interface was confirmed by the surface pressure-area isotherm and Brewster angle microscopy. The formation of nanocrystalline PdO thin film after thermal decomposition of as-deposited LB film was confirmed by X-ray diffraction and Raman spectroscopy. Nanocrystalline PdO thin films were further characterized by using UV-vis and X-ray photoelectron spectroscopic (XPS) measurements. The XPS study revealed the presence of prominent Pd(2+) with a small quantity (18%) of reduced PdO (Pd(0)) in nanocrystalline PdO thin film. From the absorption spectroscopic measurement, the band gap energy of PdO was estimated to be 2 eV, which was very close to that obtained from specular reflectance measurements. Surface morphology studies of these films using atomic force microscopy and field-emission scanning electron microscopy indicated formation of nanoparticles of size 20-30 nm. These PdO film when employed as a chemiresistive sensor showed H2 sensitivity in the range of 30-4000 ppm at room temperature. In addition, PdO films showed photosensitivity with increase in current upon shining of visible light.

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Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing

Choudhury

Betty

Bhattacharyya

et al. 2016

ACS Appl. Mater. Interfaces

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“…In the Raman spectra of Pd (5 wt%):WO 3 films, this feature gets resolved to a medium intense Raman band at 637 cm 1 . Arai et al, 38 have observed an intense band at 633 cm −1 for s Pd-O vibration (B 1g mode) in PdO single crystal. The enhancement in the intensity of the spectral feature at 600-700 cm −1 in Pd incorporated films can have contribution from both Pd-O symmetric stretching mode and grain size reduction due to Pd incorporation.…”

Section: Resultsmentioning

confidence: 96%

Micro-Structural, Electrical and Spectroscopic Investigations of Pulsed Laser Ablated Palladium Incorporated Nanostructured Tungsten Oxide Films

Lethy¹,

Beena²,

Pillai³

et al. 2009

j nanosci nanotechnol

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Pure and Pd incorporated (0.5, 1 and 5 wt%) WO3 films are prepared on quartz substrates using pulsed laser ablation (PLD) technique in an oxygen ambient of 0.12 mbar, at a substrate temperature (Ts) of 873 K. Palladium incorporation effects on the microstructure, optical and electrical properties of tungsten oxide films are systematically investigated using techniques like X-ray diffraction (XRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), micro-Raman spectroscopy, UV-Vis absorption spectroscopy and temperature dependent electrical resistivity measurements. The micro-structural analysis by XRD and micro-Raman indicates that Pd addition can perturb the tungsten oxide lattice and suppress the grain growth. Optical band gap values of the films increases from 3.17 eV for pure WO3 to 3.29 eV for 5 wt% Pd incorporated WO3 films. All the films present high transparency in the visible spectral range. The electrical resistivity studies of the pure and Pd incorporated films done at room temperature and for the range of temperature; 170-450 K reveal that Pd addition can lower the resistivity of the WO3 thin films. Room temperature resistivity as well as activation energy of the film decreases exponentially with Pd incorporation concentration. Highly transparent, nanocrystalline and semiconducting WO3 films with low resistivity obtained by Pd incorporation can make WO3 suitable for microelectronics industry and for gas sensing applications.

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“…When the temperature reached about 750 • C, the curve became flat indicating the formation of PdO. There is a significant weight loss at around 810 • C due to the decomposition of PdO followed with a reduction to metallic Pd at 850 • C [10,21].…”

Section: Resultsmentioning

confidence: 99%

Gas sensing behavior of palladium oxide for carbon monoxide at low working temperature

Zheng

Qiao

Wang

et al. 2015

Sensors and Actuators B: Chemical

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Thermally-induced optical property changes of sputtered PdOx films

Cited by 25 publications

References 37 publications

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing

Micro-Structural, Electrical and Spectroscopic Investigations of Pulsed Laser Ablated Palladium Incorporated Nanostructured Tungsten Oxide Films

Gas sensing behavior of palladium oxide for carbon monoxide at low working temperature

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Thermally-induced optical property changes of sputtered PdOx films

Cited by 25 publications

References 37 publications

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H2 Gas Sensing

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H2 Gas Sensing

Micro-Structural, Electrical and Spectroscopic Investigations of Pulsed Laser Ablated Palladium Incorporated Nanostructured Tungsten Oxide Films

Gas sensing behavior of palladium oxide for carbon monoxide at low working temperature

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Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing

Nanostructured PdO Thin Film from Langmuir–Blodgett Precursor for Room-Temperature H₂ Gas Sensing