Design of p-n heterojunction on mesoporous ZnO/Co3O4 nanosheets for triethylamine sensor

Bismuth Molybdate Nanorods Derived from a Metal–Organic Framework for Triethylamine Gas Sensors

“…In the examined temperature range, the heterojunction αβγ-BMO MOF exhibited the highest resistance. This is likely because αβγ-BMO MOF nanorods adsorbed a larger fraction of O ads on its surface than α-Bi 2 Mo 3 O 12 MOF and γ-Bi 2 MoO 6 MOF , which should trap more electrons from the MOS, thus increasing the depletion layer and the electrical resistance in the air. , …”

“…In this configuration, electrons accumulate on the surface of α-Bi 2 Mo 3 O 12 . This attracts a larger quantity of O ads at the heterojunction that will trap more electrons, thus increasing further the depletion layer and the electrical resistance of the gas sensor (Figure a). , When compared with either pure α-Bi 2 Mo 3 O 12 MOF or γ-Bi 2 MoO 6 MOF , αβγ-BMO MOF is more performant because of its higher electrical resistance and lower Φ in air and also because, when it is exposed to TEA, the larger amount of O ads on its surface releases more trapped electrons to the CB. This results in a sensor with a greater dynamic range and higher sensitivity.…”

Current Trends in Nanomaterials for Metal Oxide-Based Conductometric Gas Sensors: Advantages and Limitations—Part 2: Porous 2D Nanomaterials

“…For example, in gas sensors based on the SnO 2 nanorods/2D NiO porous nanosheet composite, the maximum sensory response was observed at a Ni:Sn ratio of 1:0.5 [ 140 ]. When developing sensors based on a composite of mesoporous ZnO/Co 3 O 4 nanosheets, the optimal Zn:Co atomic ratio is 1:0.15 [ 141 ].…”

Preparation of MOF-derived ZnO/Co3O4 nanocages and their sensing performance toward H2S

“…The three peaks of O 1s located at 530.5 eV, 531.6 eV and 532.9 eV were assigned to lattice oxygen (O L ), oxygen vacancies (O V ) and chemically adsorbed oxygen species (O C ), respectively. 15,40 Oxygen vacancy (O V ) and chemically adsorbed oxygen (O C ) are active species and can enhance the sensing performance by accumulating active O 2 on the surface of sensing materials. 41 As schematically shown in Table 1, the corresponding percentages of oxygen vacancies were calculated to be 37.9%, 52.8%, and 37.4% for ZnO/Co 19 The peaks at 468 and 482 nm can be ascribed to the interstitial oxygen and the peak at around 493 nm can be attributed to oxygen at interstitial sites forming.…”