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Carbon nanotubes (CNTs) are known to be the future of modern electronic devices due to their unique structure and extraordinary properties. In this paper, we modeled a first of its kind combinational carbon nanotube device consisting of a lanthanum strontium manganite molecule fused near the left CNT electrode and four-atom boron–nitrogen dopant atoms substituted near the right CNT electrode. Spin-resolved transport properties are studied using density functional theory. It is observed from the results that spin-resolved transport properties highly depend on the type of magnetic field applied and light conditions. The device shows efficient switching pattern and high spin filtration. The observations are made by calculating I–V characteristics, spin dependent transmission spectra, and molecular projected self-consistent Hamiltonian orbitals. Using light and spin polarization dependent properties, we have designed and realized the logic operations of and, or, and not gates. The study is useful to design a number of futuristic spin and light controlled electronic devices such as transistors, amplifiers, and oscillators. [ABSTRACT FROM AUTHOR]

Resistive-based gas sensors have been examined as the most favourable gas sensors for toxic gases and volatile organic compounds owing to their low cost, ease of use, high stability and simple structure. In this work, ammonia gas sensing self-assembled nanostructure material Ni0.5ZnxMg0.5−xFe2O4 (x = 0.00, 0.15, 0.30, 0.45) were successfully synthesized by the modified solution combustion method and examined for the structural, morphological, dielectric and gas sensing properties by X-ray diffraction, field emission scanning electron microscopy, impedance analyzer and the gas sensing setup. The dielectric properties were enhanced by Zn2+ doping. The ammonia vapour sensor based on Ni0.5ZnxMg0.5−xFe2O4 (x = 0.00, 0.15, 0.30, 0.45) shows interesting p-type behaviour gas sensing characteristics at the operational temperature of 300 K. The response to 50 ppm ammonia is 576%, 538%, 423% and 467% for x = 0.00, 0.15, 0.30, 0.45 compositions of Ni0.5ZnxMg0.5−xFe2O4 respectively while as the response and recovery time for all compositions, is in the range of 50–58 s and 64–83 s respectively. Moreover, the ammonia (reducing gas) gas sensing mechanism is also presented. The observed interesting results like sensor response and selectivity propose that the self-assembled Ni0.5ZnxMg0.5−xFe2O4 can be assuredly applied in ammonia vapour detection. [ABSTRACT FROM AUTHOR]