Synthesis and Characterization of Nano AlN Powder from Al(OH)₃/C Precursors Using a Hybrid Method Carbothermal Reduction Nitridation—Hydrothermal Autoclave Assisted
DOI:
https://doi.org/10.48048/tis.2026.11548Keywords:
Aluminium nitride (AlN), Al(OH)₃, Carbon black, Hydrothermal autoclave, CRNAbstract
A novel synthesized method using a hydrothermal autoclave assists in the carbothermal reduction nitridation (CRN) was developed to synthesize aluminum nitride (AlN) from Al(OH)₃ and carbon black as a starting material. The mass ratio of Al(OH)₃:C varies from 3:1, 4:1 and 5:1. N₂ gas with the flow rate of 0.1 L/min is flowed into an autoclave in the nitridation process with temperatures of 250, 300 and 350 °C. The characterization of synthesized AlN was observed using FTIR, XRD, SEM, PSA and UV-Vis. The FTIR results indicate that with a mass ratio of 3:1, the absorption peak was about ~488 cm⁻¹, which was the highest compared to mass ratio 4:1 (~485 cm⁻¹) and mass ratio 5:1 (~480 cm⁻¹). The success rate of synthesis is influenced by the increase in nitridation temperature. At a nitridation temperature of 350 °C, XRD results showed the formation of a homogeneous and crystalline AlN phase with an average crystallite size of about ~10.5 nm and a total crystallization percentage of 67.04%. Further SEM and PSA results verified the growth of nanostructures and reduced aggregation particles with an average size about ~125 nm. In addition, the UV-Vis spectroscopy revealed an optical bandgap of approximately 5.6 eV, aligning well with the typical semiconductor behavior of AlN.
HIGHLIGHTS
- A novel hybrid method in synthesizing AlN with low temperature using carbothermal reduction nitridation and hydrothermal autoclave-assisted was successfully developed at low temperature (250 - 350 °C).
- A homogenous AlN phase with ~10.65 crystallites and a particle size of about ~125 nm was obtained at a nitridation temperature of 350 °C.
- UV-Vis analysis resulted in a bandgap energy of 5.56 eV, typical of AlN semiconductors and suitable for electrical, thermal management, and deep-UV optoelectronic applications.
- The method enables green and efficient synthesis of nano-AlN with low-cost material (Al(OH)₃ and carbon black.
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