21. E. Nurfani, G.T.M. Kadja, M.A.K. Purbayanto, Y. Darma. “The role of substrate temperature on defects, electronic transitions, and dark current behavior of ZnO films fabricated by spray technique”. Materials Chemistry and Physics, 239, 122065. (2020).

20. W.W. Lestari, Irwinsyah, T.E. Saraswati, Y.K. Krisnandi, U.S.F. Arrozi, E. Heraldy, G.T.M. Kadja. “Composite Material Consisting of HKUST-1 and Indonesian Activated Natural Zeolite and its Application in CO2 Capture”. Open Chemistry, 17(1), 1279-1287. (2019).

19. L. Darmayanti, G.T.M. Kadja, S. Notodarmojo, E. Damanhuri, R.R.Mukti. “Structural alteration within fly ash-based geopolymers governing the adsorption of Cu2+ from aqueous environment: Effect of alkali activation”. Journal of Hazardous Materials, 377, 305-314. (2019).

18. A. Maghfirah, Y. Susanti, A.T.N. Fajar, R.R. Mukti, G.T.M. Kadja. “The role of tetraalkylammonium for controlling dealumination of zeolite Y in acid media”. Materials Research Express, 6, 094002. (2019).

17. R. Kurniawan, G.T.M. Kadja, P. Setiawan, B. Burhan, A.A. Oktaviana, Rustan, B. Hakim, M. Aubert, A. Brumm, Ismunandar. “Chemistry of prehistoric rock art pigments from the Indonesian island of Sulawesi”. Microchemical Journal, 146, 227-233. (2019).

16. G.T.M. Kadja, N. Nurdini, N.J. Azhari, M.M. Ilmi. “Modul E-Supervision: Pembimbingan secara elektronik melalui pemanfaatan Ksype dan Google Docs”. (2019).

15. G.T.M. Kadja, M.M. Ilmi. “Indonesia Natural Mineral for Heavy Metal Adsorption: A Review”. Journal of Environmental Science and Sustainable Development, 2(2), 139-164. (2019).

14. T. Puspitasari, M.M. Ilmi, N. Nurdini, R.R. Mukti, C.L. Radiman, D. Darwis, G.T.M. Kadja. “The Physicochemical Characteristics of Natural Zeolites Governing the Adsorption of Pb2+ from Aqueous Environment”.  Key Engineering Materials, 811, 92–98. (2019).

13. L. Darmayanti, S. Notodarmojo, E. Damanhuri, G.T.M. Kadja and R.R Mukti. “Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions”. MATEC Web of Conferences, 276, 06012 (2019).