A synthesis of fluorescent starch based on carbon nanoparticles for fingerprints detection

The carbon nanoparticles were synthesized by pyrolysis.The carbon nanoparticles were incorporated into nature starch to form fluorescent powder.The fluorescent powder was used as a marker in detection of latent fingerprints.

A pyrolysis method for synthesizing carbon nanoparticles (CNPs) were developed by using malic acid and ammonium oxalate as raw materials. The incorporation of a minor amount of carbon nanoparticles into starch powder imparts remarkable color-tunability. Based on this phenomenon, an environment friendly fluorescent starch powder for detecting latent fingerprints in non-porous surfaces was prepared. The fingerprints on different non-porous surfaces developed with this powder showed very good fluorescent images under ultraviolet excitation. The method using fluorescent starch powder as fluorescent marks is simple, rapid and green. Experimental results illustrated the effectiveness of proposed methods, enabling its practical applications in forensic sciences.