Bio

I am a member of Dr. Jagjit Nanda's battery lab at the SLAC-Stanford Battery Center. My research primarily focuses on electrochemical performance of DRX-based lithium-ion batteries by optimizing slurry processing techniques for large-scale applications.

Contact

  • Academic
    iaimiuwu@stanford.edu
    University - Student Department: Chemical Engineering Position: Graduate

Additional Info

All Publications

  • A reliable, colloidal synthesis method of the orthorhombic chalcogenide perovskite, BaZrS<sub>3</sub>, and related ABS<sub>3</sub> nanomaterials (A = Sr, Ba; B = Ti, Zr, Hf): a step forward for earth-abundant, functional materials CHEMICAL SCIENCE Hayes, D. C., Agarwal, S., Vincent, K., Aimiuwu, I. M., Pradhan, A. A., Uible, M. C., Bart, S. C., Agrawal, R. 2025; 16 (3): 1308-1320

    Abstract

    Recently, chalcogenide perovskites, of the form ABX3, where typically A = alkaline earth metals Ca, Sr, or Ba; B = group IV transition metals Zr or Hf; and X = chalcogens S or Se, have become of interest for their potential optoelectronic properties. In this work, we build upon recent studies and show a general synthesis protocol, involving the use of carbon disulfide insertion chemistry, to generate highly reactive precursors that can be used towards the colloidal synthesis of numerous ABS3 nanomaterials, including BaTiS3, BaZrS3, BaHfS3, α-SrZrS3 and α-SrHfS3. We overcome the shortcomings in the current literature where BaZrS3 nanoparticles are synthesized in separate phases via colloidal methods and lack a reproducible protocol for orthorhombic perovskite nanoparticles. We present a high-temperature, hot-injection method that reliably controls the formation of the colloidal BaZrS3 nanoparticles with the Pnma orthorhombic distorted perovskite structure. We show that the alternate phase, most notably denoted by its extra peaks in the pXRD pattern, is distinct from the distorted perovskite phase as it has a different bandgap value obtained via UV-vis measurements. We also show that the reaction byproducts, resulting from the use of oleylamine and CS2, have their own photoluminescence (PL) and their residual presence on the surface of the nanoparticles complicates the interpretation of PL from the nanoparticles. The utility of these nanomaterials is also assessed via the measurement of their absorption properties and in the form of highly stable colloidal inks for the fabrication of homogeneous, crack-free thin films of BaZrS3 nanoparticles.

    View details for DOI 10.1039/d4sc06116k

    View details for Web of Science ID 001378053700001

    View details for PubMedID 39691464

    View details for PubMedCentralID PMC11648698

https://orcid.org/0009-0009-0584-7714