E-Mail
IMAGE: Fingerprint patterns made in blood are clearly visible on aluminum foil (left) and painted wood (right) when developed with a fluorescent polymer. view more
Credit: Adapted from
2021, DOI: 10.1021/acsami.1c00710
Careful criminals usually clean a scene, wiping away visible blood and fingerprints. However, prints made with trace amounts of blood, invisible to the naked eye, could remain. Dyes can detect these hidden prints, but the dyes don t work well on certain surfaces. Now, researchers reporting in
ACS Applied Materials & Interfaces have developed a fluorescent polymer that binds to blood in a fingerprint without damaging any DNA also on the surface to create high-contrast images.
E-Mail
IMAGE: Photocatalytic process of phosphorus and nitrogen co-doped carbon quantum dots (PNCQDs)/TiO2 nanosheets. Due to the quantum wells created by synergy between N and P elements, photogenerated electrons can be localized. view more
Credit: Authors
In a paper published in
NANO, researchers from Nanjing Tech University proposed a theory which attributes the photocatalytic efficiency enhancement of Phosphorus and Nitrogen co-doped CQDs (PNCQDs)/TiO
2 nanosheets composite photocatalyst to the quantum wells of PNCQDs.
Doped carbon quantum dots (CQDs) have been popular nanomaterials to enhance the performance of composite semiconductor photocatalyst in recent years, since their excellent optical and electronic characteristics. In the field of fluorescence, it is commonly known that double element co-doping can effectively increase the quantum yield of CQDs because of the synergy between doping elements, but the specific mechanism is still unclear.