Abstract
It is of great significance for dynamic monitoring of foods in storage or during the transportation process through on-line detecting trimethylamine (TMA). Here, TMA were sensitively detected by Au-modified hierarchical porous single-crystalline ZnO nanosheets (HPSCZNs)-based sensors. The HPSCZNs were synthesized through a one-pot wet-chemical method followed by an annealing treatment. Polyethyleneimine (PEI) was used to modify the surface of the HPSCZNs, and then the PEI-modified samples were mixed with Au nanoparticles (NPs) sol solution. Electrostatic interactions drive Au nanoparticles loading onto the surface of the HPSCZNs. The Au-modified HPSCZNs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectrum (EDS), respectively. The results show that Au-modified HPSCZNs-based sensors exhibit a high response to TMA. The linear range is from 10 to 300 ppb; while the detection limit is 10 ppb, which is the lowest value to our knowledge.
Highlights
Freshness is one of the most important attributes to define the market value for fish in the food industry [1]
The hierarchical porous single-crystalline ZnO nanosheets (HPSCZNs) were synthesized by a one-pot wet-chemical method followed by an annealing treatment [27,28,29]
Pa × V c where P0 is the equilibrium vapor pressure at room temperature; Pa is the standard atmosphere whereVP0isisthe thevolume equilibrium vapor at room temperature; Pa is the standard atmosphere pressure; of the test pressure gas injected by the microsyringe; V c is the volume of the test i pressure; Vi is the volume of the test gas injected by the microsyringe; Vc is the volume of the test chamber
Summary
Freshness is one of the most important attributes to define the market value for fish in the food industry [1]. During the past years, sensing metal oxide semiconductors with different morphologies and structures have been used to fabricate gas sensors, such as punched ZnO nanobelt network [5], SnO2 -ZnO. It has been reported that Liu et al [14] synthesized porous single-crystalline ZnO nanosheets which exhibit high gas-sensing responses, short response time and recovery time, and possess significant long-term stability. Haiyan Song et al [15] synthesized three kinds of porous ZnO nanostructures and found that the porous single-crystalline ZnO nanosheets showed high gas-sensing property. Most of the sensing materials for TMA sensors are composed of ZnO with different morphologies which are doped by p-type semiconductor to improve sensing properties. The results show that the fabricated sensors exhibit excellent sensing performance to TMA at 260 ◦ C
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