Highly selective and sensitive xylene sensors based on Nb-doped NiO nanosheets

Dopant-mediated surface charge imbalance for enhancing the performance of metal oxide chemiresistive gas sensors

“…3b). 49–57,72,73 For a doped n-type metal oxide sensor to be sensitive toward an oxidizing gas, the generation of excess surface positive charge facilitates this purpose. Since electrons are majority carriers in n-type semiconductors, the withdrawal of electrons from an electron deficient surface shall have greater response in terms of hike in the resistance (Fig.…”

Towards Control of the Size, Composition and Surface Area of NiO Nanostructures by Sn Doping

“…It is well known that an improvement in the physical and chemical properties, and therefore in the technological applications can be achieved by using nanomaterials due to their higher porosity and huge surface-to-volume ratio [ 9 , 10 ]. Many efforts have been focused so far on the engineering of NiO morphology to provide nanostructures with high porosity and high surface area by doping with different elements [ 11 , 12 , 13 ]. On the other hand, SnO 2 has been considered as a promising candidate in several technological applications, such as solar cells [ 14 ], gas sensing [ 15 ] or Li-ion batteries [ 16 ], among others.…”

Inorganic-Diverse Nanostructured Materials for Volatile Organic Compound Sensing

“…Nanobelts (Fe doped MoO 3 nanobelts and Au decorated ZnO/In 2 O 3 belt-tooth nanostructure), nanocages (ZnO/ZnCo 2 O 4 hollow nanocages), nanosheets (Au functionalizedWO 3 ·H 2 O NShs, porous h-BN 3D NShs, and Nb-doped NiO NShs), nanoflakes (CdO hexagonal nanoflakes and ZnO-CeO 2 triangular nanoflakes), and nanospheres (ZnFe 2 O 4 NSPs and Pt doped CoCr 2 O 4 hollow NSPs) were demonstrated to volatile hydrocarbons quantitation by the researchers as noted in Table 5 [ 370 , 371 , 372 , 373 , 374 , 375 , 376 , 377 , 378 , 379 ]. Among them, Nb-doped NiO NShs and CoCr 2 O 4 hollow NSPs [ 375 , 379 ] are highly notable with their sensor responses to xylene vapor (R a /R g = 335.1 for 100 ppm at 370 °C and R a /R g = 559 for 5 ppm at 275 °C, respectively) with LODs down to sub-ppm level (0.002 ppm and 0.0187 ppm, correspondingly). In light of this, involvement of porous nanostructures is anticipated due to the high adsorption nature through the pores [ 374 ].…”

“…Nanobelts [375,379] are highly notable with their sensor responses to xylene vapor (R a /R g = 335.1 for 100 ppm at 370 • C and R a /R g = 559 for 5 ppm at 275 • C, respectively) with LODs down to sub-ppm level (0.002 ppm and 0.0187 ppm, correspondingly). In light of this, involvement of porous nanostructures is anticipated due to the high adsorption nature through the pores [374].…”