Triethylamine Gas Sensors Based on BiOBr Microflowers Decorated with ZnO Nanocrystals

Abstract

In this work, ZnO nanocrystals (NCs) are innovatively decorated on the hierarchically porous microflowers (MFs) of BiOBr. The preparation is accompanied by the construction of n−n nano-heterojunctions. The crystallographic information, microstructure, oxygen vacancy, and gas sensing performances of BiOBr/ZnO composites are investigated. The BiOBr/ZnO sensor presents excellent response characteristics to triethylamine (TEA). Compared with BiOBr MFs and pure ZnO NCs, the BiOBr/ZnO composite sensor exhibits a higher response (R a /R g ) of about 20.57 to 100 ppm TEA at 200 °C. The sensor also shows good selectivity and durable long-term stability, besides the low detection limit of 112 ppb. Even more appealingly, the response time is only 4 s. The improved TEA sensing performance of BiOBr MFs modified with ZnO NCs can be mainly attributed to the unique hierarchical heterogeneous microstructure. Furthermore, the construction of n−n BiOBr/ZnO heterostructures leads to a large specific surface area and effective electron transport, which facilitate the surface reaction and diffusion of TEA molecules. The BiOBr/ZnO composite sensor based on n−n nano-heterojunctions may provide a valuable strategy for the detection of volatile organic compounds.

Room-Temperature Triethylamine Sensor Based on Reduced Graphene Oxide/CeO2 Nanocomposites

“…Despite the great TEA-sensing properties of such sensors, they often require high operating temperatures (above 180 °C), ,, causing an increase in the power consumption and costs of the sensing device. Another major drawback of chemoresistive sensors is the worsening of the TEA-sensing performance due to humidity, which leads to a clear and significant suppression of the sensor signal when increasing humidity levels. − …”

Study on pressure-induced isostructural phase transition and electrical transport properties of BiOBr

“…[1][2][3] Among them, BiOX materials exhibit high photocatalytic activity and have been applied in many important and promising fields, such as pigments for the cosmetic industry, magnetic materials, gas sensors, phosphors, pharmaceuticals, methane oxidation coupling catalysts, etc., due to their unique crystal structure, their excellent electro-optical properties, and the s 2 grouping of Bi 3+ . [4][5][6][7][8][9][10] While most theoretical and experimental work has focused on the laminar structure of BiOX materials and their unique photocatalytic activities, [9][10][11][12][13] the study of their structural evolution under compression and its potential influence on the physical properties of BiOX materials is equally important.…”

“…, due to their unique crystal structure, their excellent electro-optical properties, and the s 2 grouping of Bi 3+ . 4–10 While most theoretical and experimental work has focused on the laminar structure of BiOX materials and their unique photocatalytic activities, 9–13 the study of their structural evolution under compression and its potential influence on the physical properties of BiOX materials is equally important.…”

Rod-Like MnMoO4 with Excellent Electrochemical Performance as Sensing Material to Detect Triethylamine

“…[17][18][19] In general, metal oxide semiconductors can be divided into p-type and n-type. 20,21 Common n-type semiconductors are ZnO, 22,23 Fe 2 O 3 , 24,25 In 2 O 3 , 26,27 MoO 3 28,29 and so on. Among them, molybdenum trioxide (MoO 3 ), as n-type semiconductor with wide-band gap, has been widely concerned for its high stability, special quantum size effect, surface effect and high reactivity.…”