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- Title
Laser damage threshold of hydrophobic up-conversion carboxylated nanocellulose/SrF<sub>2</sub>:Ho composite films functionalized with 3-aminopropyltriethoxysilane.
- Authors
Luginina, Anna A.; Kuznetsov, Sergey V.; Ivanov, Vladimir K.; Voronov, Valery V.; Yapryntsev, Alexey D.; Lyapin, Andrey A.; Chernova, Elena V.; Pynenkov, Aleksandr A.; Nishchev, Konstantin N.; Gainutdinov, Radmir V.; Petukhov, Dmitrii I.; Bogach, Alexey V.; Fedorov, Pavel P.
- Abstract
Luminescent nanocomposite films, containing SrF2:Ho up-conversion particles, were prepared by two different protocols from aqueous dispersions of TEMPO-oxidized cellulose nanofibrils (TOCNF) functionalized with 3-aminopropyltriethoxysilane (APS) without the use of organic solvents at pH = 4.0–4.5 and 9.0–9.5, respectively. Proposed synthetic protocols included the formation of the films by drying the dispersions containing pre-hydrolyzed APS adsorbed onto TOCNF and SrF2:Ho particles followed by heating at 105 °C. Hydrophobic (water contact angle 101 ± 2°), strong, and translucent TOCNF/SrF2:Ho-APS films were prepared by casting from a solution at pH = 4.0–4.5. Scanning electron microscopy, energy-dispersive X-ray spectroscopy with element mapping, Fourier-transform infrared spectroscopy, X-ray diffraction methods confirmed homogeneous distribution of up-conversion particles in TOCNF matrices as well as the grafting of linear polysiloxanes via the condensation of silanol groups and OH-groups on the surface of TOCNF. Differential scanning calorimetry and thermogravimetry data confirmed an increase in thermal stability of the APS modified nanocomposite films obtained at pH = 4.0–4.5. Hydrophobic TOCNF/SrF2:Ho-APS nanocomposite films exhibited an intense red luminescence in the visible spectrum range (5I7 level excitation of Ho3+ ions with 1912 nm laser irradiation) as well as two-times higher laser damage threshold compared to unmodified TOCNF/SrF2:Ho films. TOCNF/SrF2:Ho-APS films can be used for visualization 2 μm laser radiation in medicine and long-distance atmosphere monitoring.
- Subjects
LASER damage; CELLULOSE nanocrystals; DIFFERENTIAL scanning calorimetry; VISIBLE spectra; X-ray emission spectroscopy; LASER beams; MEDICAL lasers; TRANSLUCENCY (Optics)
- Publication
Cellulose, 2021, Vol 28, Issue 17, p10841
- ISSN
0969-0239
- Publication type
Article
- DOI
10.1007/s10570-021-04198-7