Ultrafast miniature fiber-tip Fabry–Perot humidity sensor with thin graphene oxide diaphragm

Acoustic Optical Fiber Sensor Based on Graphene Oxide Membrane

“…The deposition of the GO membrane, followed a similar method presented by Cheng Li et al [27]. This process was carried out by dip coating the capillary free end face in a water dispersion of GO with a concentration of 4 mg/mL.…”

“…In order to achieve a better control and reproducibility of the dip coating process, the sensor was mounted on a translation stage with controllable velocity. Afterwards, the fiber was placed in an oven at 60 • C for one hour to allow water evaporation, forming the GO diaphragm at the tip of the capillary through Van der Walls interactions [27,34]. By forming the GO membrane directly on the sensor, chemical etching and transferring processes are eliminated.…”

“…Recently, there has been much research on graphene and graphene-based materials due to the compelling material properties. Several works based on Fabry-Pérot interferometers with graphene and graphene-based materials have already been developed for different sensing applications [26][27][28]. Among these, acoustic fiber sensors based on graphene diaphragms have been proposed recently in literature [29][30][31].…”

“…In this work, an acoustic sensor based on a graphene oxide membrane is presented. The proposed sensor is fabricated using the method similar to the recently proposed by Chen Li et al [27]. Contrary to acoustic sensors based on graphene oxide membranes presented in literature, in this work the membrane is fabricated using a simpler procedure that does not rely on tricky chemical etching, and, consequently, reduces chemical hazards.…”

Strain-Insensitive Biocompatible Temperature Sensor Based on DNA Solid Film on an Optical Microfiber

“…O PTICAL fiber sensors are immune to electromagnetic interference, mechanically flexible, light-weighted, and can be miniaturized with a small footprint. With these advantages, optical fiber sensors have found various types of applications in measurement and monitoring physical properties [1]- [3] such as temperature [4], strain [5], refractive index (RI) [6], and humidity [7], to name a few. Especially, temperature sensing has been based on key fiber optic technologies including fiber Bragg grating (FBG) [8], photonic crystal fiber (PCF) [9], [10], external Fabry-Perot interferometer on fiber tip (EFPI) [11] and tapered micro/nanofiber [12], which are still being actively pursued in recent years.…”