High temperature grown transition metal oxide thin films: tuning physical properties by MeV N+-ion bombardment
ABSTRACT In this paper, we present a systematic study on tuning the physical properties of high temperature (373 K) grown transition metal oxide thin films by the effect of 2 MeV nitrogen ion irradiation. Although we observe irradiation induced growth in crystallite sizes for both WO 3 and MoO 3 films, no structural phase change takes place in the films due to N + -ion beam irradiation even up to the fluence of 1 × 10 15 N + cm −2 . On the other hand, irradiation leads to a significant increase in the optical absorption and the surface roughness of the films. These observations are corroborated by micro-Raman analysis. The results are attributed to the MeV ion–matter interaction.
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ABSTRACT: Transparent conducting cadmium stannate thin films were prepared by spray pyrolysis method on Corning substrate at a temperature of 525°C. The prepared films are irradiated using 120MeV swift Ag9+ ions for the fluence in the range 1×1012 to 1×1013ionscm−2 and the structural, optical and electrical properties were studied. The intensity of the film decreases with increasing ion fluence and amorphization takes place at higher fluence (1×1013ionscm−2). The transmittance of the films decreases with increasing ion fluence and also the band gap value decreases with increasing ion fluence. The resistivity of the film increased from 2.66×10−3Ωcm (pristine) to 5.57×10−3Ωcm for the film irradiated with 1×1013ionscm−2. The mobility of the film decreased from 31 to 12cm2/Vs for the film irradiated with the fluence of 1×1013ionscm−2.Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms 01/2010; 268(15):2391-2394. · 1.19 Impact Factor
Conference Paper: A solid-state vehicle detector for roadway applications[Show abstract] [Hide abstract]
ABSTRACT: In this paper, the authors present a magnetoresistive magnetometer concept as a vehicle detector. A magnetoresistive three-axis magnetometer was designed, fabricated, characterized, and tested with the purpose of detecting vehicles on highways. Testing included making measurements at in-use roadway test sites. Magnetic `signatures' of vehicles were collected and post-test data analyzed by applying a detection algorithm. Detection accuracy was greater than 90% for all types of vehicles passing over the detectorsVehicle Navigation and Information Systems Conference, 1995. Proceedings. In conjunction with the Pacific Rim TransTech Conference. 6th International VNIS. 'A Ride into the Future'; 08/1995
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ABSTRACT: E-beam evaporated CdTe thin films were processed with N+ ion bombardment as in situ process. The N+ ion glow was generated using simple Multipurpose Al probe instead of conventional plasma sources. The prepared films were identified as nano crystalline using XRD analysis. High N+ ion fluence helped to grow (311) oriented CdTe thin films instead of (220) and (111). The observed results revealed the effect of N+ ion fluence on the structural parameters like lattice parameter, d space value, crystalline size, dislocation density, micro strain etc. The observed optical band gap values lie in between 1.47 and 1.77eV. The effect of N+ ion bombardment on optical properties was also reported. Noticeable change in electrical and surface properties was also observed. The observed value shows the reproducibility asRadiation Physics and Chemistry 02/2012; · 1.38 Impact Factor