A vertically integrated ZnO-based hydrogen sensor with hierarchical bi-layered inverse opals

A bio-inspired colorimetric sensor based on ethylene glycol – non-close-packed photonic crystals for visual monitoring of ammonia

“…Colorimetric sensors based on photonic crystals (PCs) have gained interest in the visual sensing of physical, [17][18][19][20][21][22] chemical [23][24][25] and biological stimuli. [26][27][28] Photonic crystals are periodic dielectric materials, 29,30 and their photonic band gap (PBG) satisfies Bragg's diffraction law:…”

“…Colorimetric sensors based on photonic crystals (PCs) have gained interest in the visual sensing of physical, 17–22 chemical 23–25 and biological stimuli. 26–28 Photonic crystals are periodic dielectric materials, 29,30 and their photonic band gap (PBG) satisfies Bragg's diffraction law: n eff 2 = n A 2 f A + n B 2 (1 − f A )where m is the diffraction order, λ is the photonic band gap, d is the lattice distance, θ is the angle of incidence, n eff is the effective refractive index, n A and n B are the refractive index of medium A and B, respectively, and f A is the total volume percentage of medium A.…”

Preparation of Au@ZnO Nanofilms by Combining Magnetron Sputtering and Post-Annealing for Selective Detection of Isopropanol

“…Many materials, such as metal oxide semiconductors (MOS), compound semiconductors, conductive polymers and composite metal oxides, have been used for gas detection [8][9][10][11]. Attributed to the advantages of high performance, low cost, small volume and easy operation, the MOS-based gas sensors are an effective device for detecting various toxic, flammable and explosive gases, including IPA [12][13][14][15][16][17].…”

Adjustable p‐n transition behavior based on MoO 3 ‐decorated hollow α‐Fe 2 O 3 for highly hydrogen‐selective sensors

“…However, H 2 is an odorless, colorless, explosive, and flammable gas, which greatly increases the requirements for a H 2 sensor in practical application, that is, similar to an “electronic nose” that can immediately detect H 2 leakage. Metal‐oxide‐semiconductor (MOS) based gas sensor has a wide application prospect in the field of gas detection because of its fast response, high sensitivity, good stability, and low cost 4‐6 . For example, FeO‐Pd core‐shell nanospheres exhibited magnetic activity and showed excellent H 2 gas sensing properties 7 .…”

“…low cost. [4][5][6] For example, FeO-Pd core-shell nanospheres exhibited magnetic activity and showed excellent H 2 gas sensing properties. 7 Pd-doped SnO 2 nanofibers with massive oxygen vacancies were associated with their excellent H 2 gas-sensing performance.…”