Dual responsive cellulose microspheres with high solid-state fluorescence emission

TitleDual responsive cellulose microspheres with high solid-state fluorescence emission
Publication TypeJournal Article
Year of Publication2020
AuthorsYadav, P, Prajitha, KP, Dhaware, V, Subramani, M, Joy, P, Asha, SK, Shanmuganathan, K
JournalColloids and Surfaces A-Physicochemical and Engineering Aspects
Volume591
Pagination124510
Date PublishedAPR
Type of ArticleArticle
ISSN0927-7757
KeywordsFluorescent, Magnetic, Microcrystalline cellulose, microspheres, Stimuli responsive microspheres, Tetrabutylammonium hydroxide
Abstract

Materials that respond to multiple stimuli such as magnetic field and light are attractive for security and medical diagnostic applications. One of the major challenges in dual functional microspheres is that the presence of magnetic nanoparticles can quench fluorescence emission. Also, there is a probability of solid-state quenching due to the proximity of the fluorophore. We report here a facile approach to prepare cellulose microspheres with high solid-state fluorescence using 40 % tetrabutylammonium hydroxide (TBAH). The fluorescence quenching effect due to the presence of Fe3O4 nanoparticles and solid-state quenching due to aggregation of fluorophore was systematically investigated. Microspheres with the detectable magnetic response and fluorescence quantum yield as high as 0.57 (FMB 414) was obtained by optimizing the reaction conditions. Such a high quantum yield has not been reported before for dual stimuli-responsive fluorescent microspheres. The magnetic and fluorescent properties were found to be durable even after multiple washing cycles. These dual responsive cellulose microspheres can be added as security features to authenticate documents such as passports, degree certificates, currency notes, financial documents etc.

DOI10.1016/j.colsurfa.2020.124510
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

3.990

Divison category: 
Physical and Materials Chemistry
Polymer Science & Engineering

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