Ambient Stable CsPbBr₃/ZnO Nanostructures for Ethanolamine Sensing

Abstract

Continuous monitoring of volatile organic compounds (VOCs) is an important challenge for human beings. Allinorganic halide perovskites (AIHPs) have attracted extensive attention because of their excellent semiconductor properties. Perovskite interfacial modulation engineering is considered as a key factor in the preparation of stable and high-performance AIHP devices. In this work, organic hydrophilic ligand 3-mercaptopropionic acid (MPA) is creatively introduced to regulate the nanostructure of CsPbBr 3 and construct the ambient stable binary heterojunction of CsPbBr 3 nanoparticles (NPs)/ZnO NPs. The microscopic morphology design shows that CsPbBr 3 NPs with the optimal nano size have abundant sensitive gas adsorption sites and large specific surface area, which can effectively improve the sensitivity of the CsPbBr 3 -based sensor to ethanolamine (EA). Moreover, hydrophilic groups in MPA are good for the formation of hydrogen bonds and MPA network structures, which effectively improve the binding affinity of metal oxides on MPA surfaces, enhancing the stable anchoring of ZnO to halide perovskite CsPbBr 3 and the heterojunction construction of CsPbBr 3 /ZnO. The CsPbBr 3 -2MPA/ZnO sensor displays the advantages of the lowest theoretical detection limit (DL, 31 ppb), excellent selectivity, a much shorter response time (50 s) than CsPbBr 3 , and significantly enhanced EA response (13.25, 100 ppm) at room temperature, besides the stable repeatability in more than 1 month. In addition, we propose a feasible sensing mechanism. The gas sensor based on CsPbBr 3 /ZnO nano-heterojunctions with efficient hydrophilic MPA modulation may provide constructive idea for the detection of VOCs.

Three-Dimensional van der Waals Heterostructure-Based Nanocages as Supersensitive 3-Hydroxy-2-butanone Gas Sensors at Room Temperature

“…Through the above methods, we could prove that Co-TAPP-COFs@SnO 2 @MWCNTs-based sensing materials exhibited a more uniform distribution of active center dispersion on the surface. In addition, the uniform distribution of active sites in the sensing composite materials was conducive to the rapid transport of carriers within the nanoporous network . The electron transfer of SnO 2 @MWCNTs was poor, probably because of the poor connection between SnO 2 @MWCNTs and the interdigital electrode.…”

“…In addition, the uniform distribution of active sites in the sensing composite materials was conducive to the rapid transport of carriers within the nanoporous network. 49 The electron transfer of SnO 2 @ MWCNTs was poor, probably because of the poor connection between SnO 2 @MWCNTs and the interdigital electrode. This work aimed to promote the conductive connection between Co-TAPP-COFs@SnO 2 @MWCNTs and the interdigital electrode and further improve the activity of Co-TAPP-COFs@ SnO 2 @MWCNTs, promoting the gas sensor to achieve high sensitivity and fast sensing response under the conditions of room temperature and high relative humidity.…”

Cs2AgBiBr6 Quantum Dots Supported on Co3O4 Nanocages for Acetone Detection at Room Temperature

“…The 2.0 wt % QDs-Co 3 O 4 sensor's fast response/recovery time to acetone may be attributed to the passivation of surface defects of Co 3 O 4 by an appropriate amount of CABB QDs, which increases the carrier mobility between CABB QDs and Co 3 O 4 , thereby accelerating gas response and recovery. 22 Figure 6c exhibits the dynamic response to acetone, whose concentration ranges from 30 to 120 ppm. As the concentration of CABB QDs increases, the response values of the sensors also increase.…”

“…Their gas sensors, which utilize CsPbBr 3 / ZnO heterojunctions and efficient hydrophilic 3-mercaptopropionic acid (MPA) modulation, demonstrated the benefits of a theoretical low detection limit (31 ppb) and increased EA response (13.25, 100 ppm) at RT. 22 23 However, despite the superb sensing performance using lead-based perovskites, Pb as a divalent cation in the synthesis and use of the material, which not only affects the environment but even poses a risk to human health, and the use of lead is currently being gradually restricted. 24 To reduce the impact of Pb on the environment and human health, Cs 2 AgBiBr 6 (CABB) is gradually being applied.…”

“…Xu et al established an ambiently stable binary heterojunction consisting of CsPbBr 3 NCs and ZnO nanoparticles for detecting ethanolamine (EA). Their gas sensors, which utilize CsPbBr 3 /ZnO heterojunctions and efficient hydrophilic 3-mercaptopropionic acid (MPA) modulation, demonstrated the benefits of a theoretical low detection limit (31 ppb) and increased EA response (13.25, 100 ppm) at RT . Shao et al designed a nanostructure composed of CsPbI 3 NCs modified with SnO 2 quantum nanoparticles (QNPs)/MWCNTs.…”