A novel direct way to synthesis Zinc oxide-tin dioxide heterojunction (ZTH) using a simple grinding technique without employing successive processes has been introduced. A facile, rapid and economical fabrication strategy was studied using various characterization tools. The underlining mechanism of adhesion was studied using finite elemental simulation tools. The heterojunction was further processed into PDMS based composite for the realization of nanogenerator. The ZTH showed a 4 fold improved response compared to intrinsic ZnO which is based on novel n–n bulk heterojunction principle. The peak to peak voltage was around 12 V with a current of 60–70 nA. The calculated power density was 1.7 mW/m2 and load sensitivity was around 1.5 V/N. The device was further demonstrated to charge the commercial capacitors and is used for biomechanical energy harvesting. Finally, a novel piezoelectric smart gas purging system (P-SMGP) was demonstrated using the device which may find applications in chemistry lab and food industry.