Light
Responsive Silk Nanofibers: An Optochemical Platform for Environmental
Applications
Posted on 2017-11-09 - 16:50
Photochromic spiropyran-doped silk
fibroin poly(ethylene oxide) nanofibers which combine the attractive
properties and biocompatibility of silk with the photocontrollable
and reversible optical, mechanical, and chemical response of the spiropyran
dopants are herein presented. As proved, the reversible variation
of the absorption and emission signals of the mats and of their Young’s
modulus upon alternate UV and visible light irradiation is ascribed
to the reversible photoconversion of the spiropyran form to its polar
merocyanine counterpart. Most importantly, the interactions of the
merocyanine molecules with acidic vapors as well as with heavy metal
ions dispersed in solution produce analyte-specific spectral changes
in the emission profile of the composite, accompanied by a characteristic
chromic variation. Because of the high surface-to-volume ratio of
the nanofibrous network, such interactions are fast, thus enabling
both an optical and a visual detection in a 30–60 s time scale.
The sensing platform can be easily regenerated for more than 20 and
3 cycles upon acid or ion depletion, respectively. Overall, the photocontrolled
properties of the silk composites combined with a straightforward
preparation method render them suitable as porous materials and scaffolds
with tunable compliance and reusable nanoprobes for real time optical
detection in biomedical, environmental, and industrial applications.
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Genovese, Maria E.; Caputo, Gianvito; Nanni, Gabriele; Setti, Chiara; Bustreo, Matteo; Perotto, Giovanni; et al. (2017). Light
Responsive Silk Nanofibers: An Optochemical Platform for Environmental
Applications. ACS Publications. Collection. https://doi.org/10.1021/acsami.7b13372
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AUTHORS (8)
MG
Maria E. Genovese
GC
Gianvito Caputo
GN
Gabriele Nanni
CS
Chiara Setti
MB
Matteo Bustreo
GP
Giovanni Perotto
AA
Athanassia Athanassiou
DF
Despina Fragouli
KEYWORDS
emission profilemetal ionstime scalelight irradiationdetectionion depletionphotocontrolled propertiesOptochemical Platformlight Responsive Silk NanofibersinteractionUVmerocyanine counterpartmerocyanine molecules3 cyclestunable complianceacidic vaporssurface-to-volume ratiospiropyran dopantssilk compositesspiropyran formchemical responsevariationpreparation methodemission signalsnanofibrous network