Luminescent films functionalized with cellulose nanofibrils/CdTe quantum dots for anti-counterfeiting applications

摘要

A facile and robust strategy is required to fabricate films with highly photoluminescent for application in the field of anti-counterfeit marking. Here we report a kind of multifunctional bio-nanocomposite film with CdTe quantum dots (QDs) decorated with cellulose nanofibrils (CNFs). In this work, CNFs were introduced as nanothin film matrix, and crosslinking modification with EDC/NHS through covalent binding was used to introduce the CdTe QDs to prepare the nanoscale TEMPO-CNF/CdTe QDs nanocomposite material with uniform distribution, controllable particle size and good photoelectric properties. The TEMPO-CNF/CdTe QDs films displayed high optical transmittance ( 80%) over the entire range of visible light, high quantum yield (36.9%), large tensile strength (110.0 MPa) and good hydrophilicity (contact angles of approximately 30 degrees). These results indicated that functional TEMPO-CNF/CdTe films material with the colorimetric identification and photoluminescence was constructed and successfully applied to the "Green" anti-counterfeit marking.