Even though the application of nanoparticles (NPs) in enhanced oil recovery (EOR) has been reported, but the development of different novel and efficient materials and their potential in EOR still need to explore. In this work, zinc nitride (Zn 3 N 2 ) were developed and explored for enhanced oil recovery. Zinc nitride (Zn 3 N 2 ) nanoparticles with triangular shape morphology were synthesized using sol-gel auto combustion method. The prepared NPs were characterized using X-ray diffraction and Field emission scanning electron microscopy for crystal structure, shape and size. The results reveal the formation of Zn 3 N 2 triangular shape particles. Zn 3 N 2 nanofluids of different concentrations were prepared and their effect on oil-water interfacial tension (IFT) under electromagnetic waves (EM) was investigated. The reduction in IFT was observed by introducing nanoparticles. It was found that Zn 3 N 2 nanofluid under EM waves can bring an additional reduction in IFT. The value of IFT at 0.1 wt of Zn 3 N 2 under EM waves of frequency 2.2 MHz was 0.55 mN/m which is 75 reduction. © Published under licence by IOP Publishing Ltd.