Optical Fiber Coated with Nanocrystalline Tin Oxide for Ammonia Vapour Sensing

A low cost and reliable fiber optic ethanol sensor based on nano-sized SnO2

“…Due to these attractive properties, in recent years, fiber optic sensors have become an emerging field in detection of target gases [15,16]. Several types of fiber optic sensors based on evanescent waves [15][16][17][18][19][20][21][22], surface plasmon resonance [23,24], fiber Bragg grating [25,26], photonic crystals [27] and Fabry-Pérot interferometer [28] have been investigated. Among them, fiber optic sensors based on evanescent waves are low cost, simple to design and operation, have good sensitivity and high signal to noise ratio [29].…”

“…Different materials have been used as a modified clad, such as polymers [30], cryptophanes [31], carbon nanotubes [32] and metal oxide semiconductors [15][16][17][18]33]. Metal oxide gas sensors based on SnO 2 , ZnO, WO 3 , etc.…”

“…In recent years, several evanescent field fiber optic gas sensors with metal oxide sensitive layer have been reported [15][16][17]22,36,37]. Both single-mode [22] and multimode [15][16][17]36,37] fiber optics are used to design the mentioned sensors.…”

“…Both single-mode [22] and multimode [15][16][17]36,37] fiber optics are used to design the mentioned sensors. Single-mode fibers are smaller, cheaper and lighter than multimode fibers.…”

Uniform decoration of silver nanoparticle on exfoliated graphene oxide sheets and its ammonia gas detection

“…Sensitivity (counts/ppm) Table 1 rGO (present work) 0.08 0.1 M AgNP-GO composite (present work) 0.17 0.6 M AgNP-GO composite (present work) 0.12 GO [21] 0.32 110°C heat treated GO (GO 110 ) [21] 0.15 220°C heat treated GO (GO 220 ) [21] 0.07 Silver nanowire [30] 0.17 SWCNT (30 wt.% purity, 1.3 nm diameter) [31] 0.26 SWCNT (94 wt.% purity, 1.3 nm diameter) [31] 0.11 MWCNT (95 wt.% purity, 4-12 nm diameter) [31] 0.16 Li doped ZnO [32] 0.15 SnO 2 [33] 0.09…”