GIWAXS often used for Polymer, since it can evaluate the Edge-On and Face-On Orientation. Can we use GIWAXS to evaluate the crystallinity of Metal Oxide as ETL (electron Transporting layer)?
You can take XRD and SAED patterns of metal oxides. You can get idea about crystallinity, single crystalline or polycrystalline materials, and also lattice spacing values of metal oxides.
Luan, C., Wang, C., Xu, B., Geng, Y., Zhang, L., Wang, Q. and Cui, D., 2015. A Strategy for Improving the Interfacial Crystallinity and Carrier Mobility of SnO2 Porous Nanosolids. arXiv preprint arXiv:1508.06822.
I also strongly recommend you to perform XRD and TEM-SAED analysis if you want to know the crystalline nature of your TiO2. In addition, you can check these publications:
1. Azhar Ali Haidry, P. Ďurina, M. Tomášek, J. Greguš, P. Schlosser, M. Mikula, M. Truchlý, T. Roch, T. Plecenik, A. Pidík, M. Zahoran, P. Kúš, A. Plecenik: Effect of post-deposition annealing treatment on the structural, optical and gas sensing properties of TiO2 thin films, Key Engineering Materials, Vol. 510-511 (2012), pp. 467-474. www.scientific.net/KEM.510-511.467.
2. Azhar Ali Haidry, Cagdas Cetin, Klemens Kelm, Bilge Saruhan, Sensing mechanism of low temperature NO2 sensing with top-bottom electrode (TBE) geometry, Sensors and Actuators B Chemical 03/2016; doi:10.1016/j.snb.2016.03.016
3. Azhar Ali Haidry, Andrea Ebach-Stahl, Bilge Saruhan, Effect of Pt/TiO2 interface on room temperature hydrogen sensing performance of Memristor type Pt/TiO2/Pt structure, Sensors and Actuators B Chemical Volume 253, December 2017, Pages 1043-1054