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Flexible polymer-based piezoelectric nanogenerators have attracted the researchers the most due to their mechanical flexibility, low fabrication cost and pollution-free energy harvesting from sources such as vibration, mechanical load, human motion and waste heat. Here, we report a flexible piezoelectric nanogenerator with different kinds of nanofiller such as reduced graphene oxide and bismuth aluminate Bi 2 Al 4 O 9 ceramic in Polyvinylidene fluoride (PVDF) matrix. The structural and morphological properties of nanocomposite films are examined by X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The Fourier transform infrared spectroscopy (FTIR) studies revealed the fraction of β-phase enhancement from 53 to 76% with incorporation of these nanofillers. The nanocomposite films of PVDF/Bi 2 Al 4 O 9 /RGO showed maximum value of remnant polarization (P r) is 0.0189 μC/cm2 at an electric field of 165 kV/cm and the value of electric output voltage and current generated from nanocomposite films is 5.92 V and 0.76 μA for PVDF/Bi 2 Al 4 O 9 /RGO based nanocomposite. The PVDF/Bi 2 Al 4 O 9 /RGO based nanocomposite generates a maximum output power density of 0.457 μW/cm2 at 12 MΩ resistance which is around 20 times more than that of bare PVDF film. • The nanocomposite of PVDF/RGO, PVDF/Bi 2 Al 4 O 9 and PVDF/Bi 2 Al 4 O 9 /RGO are prepared via sol-casting method. • The value polar β-phase enhancement from 53% in PVDF to 76% in PVDF/Bi 2 Al 4 O 9 /RGO. • The P-E loop studies reveal that value of P r is maximum for PVDF/Bi 2 Al 4 O 9 /RGO. • The value of voltages and current for PVDF/Bi 2 Al 4 O 9 /RGO is found 5.92 V and 0.76μΑ. [ABSTRACT FROM AUTHOR]

Orthorhombic as well as cubic phase Cd 2 SnO 4 nanoparticles have been synthesized by one step solution combustion method. X-ray diffraction result confirms the high crystallinity and phase purity of the synthesized nanoparticles. TEM images reveals, the synthesized nanoparticles have spherical morphology with an average diameter of 30 nm for both phases. EDS spectra affirms the stoichiometric Cd 2 SnO 4 nanoparticles. Further, the gas sensors were fabricated using thick film, deposited on alumina substrate by doctor blade method, of the synthesized nanoparticles. In order to determine the sensitivity and detection limit, 1 μL of diluted VOCs was inserted into the sensing chamber at atmospheric pressure and the variation of resistance with respect to time has been monitored. The sensing result suggests that cubic and orthorhombic phase nanoparticles are highly sensitive (S ̴ 65%) and selective towards isopropanol and methanol vapors, respectively, at 170 °C. The phase dependent selectivity and high sensitivity of the Cd 2 SnO 4 spherical nanoparticles based sensors at low operating temperature towards diluted isopropanol and methanol at atmospheric pressure are the important findings of the present work. • Phase pure synthesis of cubic and orhtorhombic Cd 2 SnO 4 nanoparticles through solution combustion method. • Cubic and orhtorhombic Cd 2 SnO 4 nanopartcicle showed excellent sensitivity towards IPA and methanol, respectively at 200 °C. • The phase dependent selectivity shifting behaviour of Cd 2 SnO 4 nanoparticles has been studied. [ABSTRACT FROM AUTHOR]