Nanocarbon powder for latent fingermark development: a green chemistry approach

摘要

Optimal fingermark developing product would have the following attributes; small, rounded and well-dispersed particles, which has high affinity for the fingermark residue but exhibits minimal interaction with the substrate bearing the fingermark. However, most commercial powder formulations still utilise fine particles in the range of 1 to 10 μm. Ageing of the filtrate from rice husk acid digestion produced amorphous nanocarbon powder (NP) that exhibited non-smooth, slightly irregular spherical particles with a higher degree of agglomeration. Particle size distribution fell in the range of 100 to 500 nm with mean particle size of 300 nm. Molecular bonding and chemical composition of the NP was characterised using spectroscopic techniques. Findings revealed that the nanoparticle powders and reagent performed on par with the existing commercial powders and exhibited higher selectivity. Nanoparticle synthesis from low-cost precursor in this research did not require special equipment, addition of resins or adhesives, or surface passivation. Nanocarbon powder is exploitable as fingermark developing powder generated from a sustainable source.