Mesoporous Tungsten Oxides with Crystalline Framework for Highly Sensitive and Selective Detection of Foodborne Pathogens

Abstract

Foodborne pathogens like Listeria monocytogenes can cause various illnesses and pose a serious threat to public health. They produce species-specific microbial volatile organic compounds, i.e., the biomarkers, making it possible to indirectly measure microbial contamination in foodstuff. Herein, highly ordered mesoporous tungsten oxides with high surface areas and tunable pores have been synthesized and used as sensing materials to achieve an exceptionally sensitive and selective detection of trace Listeria monocytogenes. The mesoporous WO-based chemiresistive sensors exhibit a rapid response, superior sensitivity, and highly selective detection of 3-hydroxy-2-butanone. The chemical mechanism study reveals that acetic acid is the main product generated by the surface catalytic reaction of the biomarker molecule over mesoporous WO. Furthermore, by using the mesoporous WO-based sensors, a rapid bacteria detection was achieved, with a high sensitivity, a linear relationship in a broad range, and a high specificity for Listeria monocytogenes. Such a good gas sensing performance foresees the great potential application of mesoporous WO-based sensors for fast and effective detection of microbial contamination for the safety of food, water safety and public health.

Fe modified mesoporous hollow carbon spheres for selective oxidation of ethylbenzene

“…It was worth noting that the Fe-MHCs exhibited good catalytic performance in the selective oxidation of ethylbenzene. The conversion of ethylbenzene could reach 94.5% and the selectivity of product acetophenone was 97.4%, which were better than the other results reported in some literatures [8][9][10][11]22].…”

“…Furthermore, the hollow nanostructures with mesoporous shells could facilitate the fast diffusion of reactants and products due to the short diffusion pathway, larger pore, cavity volume, and spherical morphology [5][6][7]. Templating including hard and soft template method has been widely used to synthesize MHCs [8][9][10][11]. Generally, the morphology and the monodispersity of the as-prepared hollow products by soft template method are less satisfactory than that by hard template due to the polydispersity and dynamics [12].…”

Molecular Design Strategy for Ordered Mesoporous Stoichiometric Metal Oxide

“…[12] Novel rigid templates such as the lab-made diblock copolymers (for example,P I-b-PEO) has been developed to solve this challenge. [13] Nevertheless,t he multiple steps,l aboratory scale,a nd toxic chemicals greatly limit its extension and application. Moreover,t he uniform dispersion of Li and Ti precursors is another prerequisite for the synthesis of Li 4 Ti 5 O 12 .H owever,m ost of solid-state reactions employing TiO 2 nanoparticles as the Ti precursor,w hich could not be homogeneously mixed with Li salts at the atomic scale,t hus leading to higher crystallization temperature and micrometersized particles with poor porosity.…”

Molecular Design Strategy for Ordered Mesoporous Stoichiometric Metal Oxide

“…[11] However,c onventional commercial block copolymer templates such as Pluronic P123, F127 cannot stabilize the ordered mesostructures at the temperature higher than 500 8 8C. [13] Nevertheless,t he multiple steps,l aboratory scale,a nd toxic chemicals greatly limit its extension and application. [13] Nevertheless,t he multiple steps,l aboratory scale,a nd toxic chemicals greatly limit its extension and application.…”