New stand-alone hygrometers based on the moisture-driven bending of a nanoclay and polyimide bilayer

Fully Printed Cellulose Nanofiber–Ag Nanoparticle Composite for High-Performance Humidity Sensor

“…formed from the redox reaction between the Ag + ions of AgNO3 and NaBH4 w vealed from the cellulose spectrum of the characteristic UV-vis absorption band ally in the 400-450 nm range, as well as from the visible yellow color change [21-2 color persisted in the CNF-AgNP compound for 3 months, indicating that the synthesized on cellulose exhibit excellent stability[24].The presence of AgNPs was also confirmed using XRD. As shown in Fig diffraction peaks corresponding to the (111), (200), (220), and (311) planes of AgN peared at 38°, 44°, 64°, and 77°, respectively[19]. In addition, the XRD peaks of 16°, 22°, and 34° were confirmed to be consistent with the (110), (200), and (004) p cellulose I[25].…”

“…This color persisted in the CNF-AgNP compound for 3 months, indicating that the AgNPs synthesized on cellulose exhibit excellent stability[24].The presence of AgNPs was also confirmed using XRD. As shown in Figure4b, diffraction peaks corresponding to the (111), (200), (220), and (311) planes of AgNPs appeared at 38 • , 44 • , 64 • , and 77 • , respectively[19]. In addition, the XRD peaks of CNF at 16 • , 22 • , and 34 • were confirmed to be consistent with the (110), (200), and (004) planes of cellulose I[25].…”

“…The presence of AgNPs was also confirmed using XRD. As shown in Figure 4 b, diffraction peaks corresponding to the (111), (200), (220), and (311) planes of AgNPs appeared at 38°, 44°, 64°, and 77°, respectively [ 19 ]. In addition, the XRD peaks of CNF at 16°, 22°, and 34° were confirmed to be consistent with the (110), (200), and (004) planes of cellulose I [ 25 ].…”

“…Cellulose is a colorless, odorless, and non-toxic solid polymer with desirable properties such as high mechanical strength, hydrophilicity, relative thermal stability, biocompatibility, low cost, and eco-friendliness [ 14 ]. In recent years, cellulose-based composites have been researched for coatings, pharmaceuticals, laminates, fibers, optical films, smart materials, and flexible sensing devices [ 15 , 16 , 17 , 18 , 19 ]. Recently, an all-cellulose-derived humidity sensor was made by using the direct laser writing of electrodes onto TEMPO-oxidized cellulose paper [ 18 ].…”

Multi-responsive and programmable actuators made with nacre-inspired graphene oxide-bacterial cellulose film

“…[1][2][3][4][5] The physical stimuli can be electric, [6][7][8] light, 9 heat, 10 pressure, 11 and magnetism. 12 The chemical stimuli can be pH, 13 water vapor, 14,15 and other solvent vapor. 16 There are two main assembly methods for actuators.…”