Functional Film Coated Optical Micro/Nanofibers for High-Performance Gas Sensing

Recent Progress in Microfiber-Optic Sensors

“…Owing to the large evanescent fields with high surface intensity, functional material-integrated microfiber devices offer strong light-matter interactions for sensing applications. Various aforementioned microfiber structures have been reported for integration with plasmonic materials [150][151][152][153][154][155][156], polymers [49,[157][158][159][160], two-dimensional (2D) materials [161][162][163][164][165][166][167][168][169][170][171][172][173], sol-gels [174,175], magnetic fluids [176][177][178], and biomaterials [41]. For example, Fig.…”

Micro-/Nanofiber Optics: Merging Photonics and Material Science on Nanoscale for Advanced Sensing Technology

“…Note that the encapsulation of the MNFs must not sacrifice their large fractional evanescent fields, low-loss optical transmission, and excellent mechanical properties. So far, several groups have reported different embedded MNF sensors by using low RI polymers, such as PDMS (Polynkin et al, 2005), Teflon Lou et al, 2010), EFIRON PC-373 (Vienne et al, 2007), and Nafion (Cai et al, 2019). In addition, silica aerogel (Xiao et al, 2009) is another promising material for embedding MNFs owing to its very low RI (n = 1.05), gas-permeability, and hydrophobicity.…”

“…To address these issues, Cai et al demonstrated a new functional-film-coated MNF structure for gas sensing. By using Nafion as a host polymer of crystal violet and a microflow cell as the sensing chamber, respectively, the sensor exhibits an approximately linear response to RH ranging from 30% to 100% and an estimated resolution of 0.3%RH (Cai et al, 2019).…”

Reversible microfluidic measurement with zinc tetraphenylporphyrin aiming at slipping NH3detection

“…By contrast, our device is reusable, which makes it more beneficial to save the cost in the industry. Besides, a complex micro‐distillation technique [36] or even no technique [37] was used to selectively separate ammonia in previous work. Compared with them, we used a polydimethylsiloxane (PDMS) membrane to achieve efficient ammonia separation, which was extremely easy to operate.…”