Trimethylamine Sensors Based on Au-Modified Hierarchical Porous Single-Crystalline ZnO Nanosheets

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.

Metal Oxide Nanostructures in Food Applications: Quality Control and Packaging

“…TMA detection may give useful information to determine the fish and the seafood freshness. TiO 2 , WO 3 , and ZnO with different shapes showed a good response towards TMA [55][56][57][58]. The functionalization of WO 3 nanorods, ZnO ( Figure 4) and MoO 3 by Au improved the material's response due to the catalytic effect of Au [56,58,59].…”

“…TiO 2 , WO 3 , and ZnO with different shapes showed a good response towards TMA [55][56][57][58]. The functionalization of WO 3 nanorods, ZnO ( Figure 4) and MoO 3 by Au improved the material's response due to the catalytic effect of Au [56,58,59]. Introduction of Cr 3+ in 1D ZnO nanostructures or their coupling with Cr 2 O 3 and In 2 O 3 can enhance the response and selectivity of the materials towards TMA [57,60,61].…”

MoS2 Nanosheets Sensitized with Quantum Dots for Room-Temperature Gas Sensors

“…The high operating temperature of semiconductor gas sensors also sets a limit to their integrability with CMOS technology or flexible electronic system. Thereby, novel nanostructured materials [7][8][9][10] with the potentials for room-temperature gas sensors have become a hot research topic.…”

Impedimetric Detection of Ammonia and Low Molecular Weight Amines in the Gas Phase with Covalent Organic Frameworks

“…It is well known that detecting sensitive and selectively ammonia is a challenge. Up to now, several techniques have been used in commercial ammonia detectors, among them, metal-oxide gas sensors [7][8][9][10][11], conducting polymer analyzers, and detection optical methods [12][13][14][15][16][17]. However, these strategies exhibit some disadvantages associated with high temperatures and irreversible reactions causing poisoning and lack the selectivity or sensitivity.…”