Functional nanocellulose films as fluorescent media

Johanna Mae M. Indias; Raphael A. Guerrero; Marina Scarpa; Paolo Bettotti

doi:10.1117/12.2502699

25 October 2018 Functional nanocellulose films as fluorescent media

Johanna Mae M. Indias, Raphael A. Guerrero, Marina Scarpa, Paolo Bettotti

Proceedings Volume 10823, Nanophotonics and Micro/Nano Optics IV; 1082311 (2018) https://doi.org/10.1117/12.2502699
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

Fluorescent nanocellulose films fabricated via 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-mediated oxidation of cellulose nanofibers were prepared using two methods. In the first process, fluorescent particles were added halfway through the last vacuum filtration step of film fabrication. Three different particles were used: micro-pSi, micro-pSi with COOH, and Si-COOH nanocrystals. Several optical techniques were employed to characterize resulting films: UV-Vis spectrophotometry, fluorescence spectrophotometry, scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) microscopy. All techniques revealed that particles retained their intrinsic properties after deposition on the film. Photoluminescence spectra of resulting films at λ_excitation = 350 nm exhibited the following fluorescence peaks: λ_micro-pSi = 600 nm, λ_micro-pSi _{with COOH} = 596 nm, λ_{Si-COOH nanocrystals} = 618 nm. A blue shift of at most 20 nm was observed when comparing particle fluorescence peak emission before and after deposition on the film. The peak shift was attributed to oxidation, as the particles remained in an aqueous solution during film fabrication. Continued observation of film fluorescence spectra showed that peak emission values are maintained for a month. A second method of fluorescent film fabrication involved the immersion of a dry, transparent nanocellulose film in a chlorophyll in acetone solution. Fluorescence spectra of the resulting hybrid film were taken using a UV laser as the excitation source (λ_excitation = 355 nm). The fluorescence peak was found to be λ_chlorophyll = 683.21 nm. Both methods of film hybridization were effective in preparing nanocellulose films that show promise as stable fluorescent media.

Citation Download Citation

Johanna Mae M. Indias, Raphael A. Guerrero, Marina Scarpa, and Paolo Bettotti "Functional nanocellulose films as fluorescent media", Proc. SPIE 10823, Nanophotonics and Micro/Nano Optics IV, 1082311 (25 October 2018); https://doi.org/10.1117/12.2502699

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KEYWORDS

Luminescence

Particles

Oxidation

Nanocrystals

Silicon

Scanning electron microscopy

Silicon films

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