Multichannel pathway-enriched mesoporous NiO nanocuboids for the highly sensitive and selective detection of 3-hydroxy-2-butanone biomarkers

Abstract

Novel mesoporous NiO nanocuboids (M-NiO NCs) enriched with surface multichannel pathways have been achieved to sensitively detect 3H-2B biomarkers for real-time monitoring of Listeria monocytogenes.

Highly Sensitive and Selective NiO/WO3 Composite Nanoparticles in Detecting H2S Biomarker of Halitosis

“…In addition, the high-resolution spectrum in Figure b of W 4f shows two distinct peaks located at 35.47 and 37.53 eV corresponding to the W 4f 7/2 and W 4f 5/2 , respectively. In Figure c, the peaks in the Ni 2p spectrum of 2.1 wt % NiO/WO 3 NPs are located near 855.5, 856.6, and 862.09 eV, which are assigned to Ni 2+ 2p 3/2 , Ni 3+ 2p 3/2 , and satellite peaks of Ni 2p 3/2 , respectively . The O 1s XPS spectrum is shown in Figure d, in which the peaks located at 530.29, 530.9, and 532.1 eV are assigned to O 2– , O – , and O 2 – , respectively.…”

“…In Figure 2c, the peaks in the Ni 2p spectrum of 2.1 wt % NiO/ WO 3 NPs are located near 855.5, 856.6, and 862.09 eV, which are assigned to Ni 2+ 2p 3/2 , Ni 3+ 2p 3/2 , and satellite peaks of Ni 2p 3/2 , respectively. 9 The O 1s XPS spectrum is shown in Figure 2d, in which the peaks located at 530.29, 530.9, and 532.1 eV are assigned to O 2− , O − , and O 2 − , respectively. Among them, O 2− is the lattice oxygen species, which is the stable oxygen component in the crystal lattice, while O − and O 2 − are the chemisorbed oxygen species, reacting with target gas on the surface of sensing materials.…”

“…Fortunately, the detection of biomarkers employing gas sensors is reported as a newly emerging technique. − Similarly, monitoring H 2 S biomarker in exhaled breath may indirectly diagnose halitosis. However, such gas sensors are required with critically high selectivity and sensitivity as well as a ppb-level detection limit.…”

“…However, such gas sensors are required with critically high selectivity and sensitivity as well as a ppb-level detection limit. To address such issues from the aspect of sensing materials, metal-oxide semiconductors (MOSs) received extensive attention due to low cost, fast response, and facile operation. ,,− First, to obtain high sensitivity, CuO-loaded SnO 2 hollow spheres have been developed to detect H 2 S . Second, to achieve excellent selectivity, Pd-decorated WO 3 nanofibers are utilized to improve the H 2 S selectivity .…”

Recent Progress of Nanostructured Sensing Materials from 0D to 3D: Overview of Structure–Property‐Application Relationship for Gas Sensors

“…Some n‐type MOSs such as ZnO, [ 9 ] SnO 2 , [ 10 ] WO 3 , [ 11 ] In 2 O 3 , [ 12 ] and Fe 2 O 3 [ 13 ] were found to exhibit great sensing performances. Compared with n‐type MOS‐based sensors, the researches on p‐type MOSs such as NiO, [ 14 ] CuO, [ 15 ] and Co 3 O 4 [ 16 ] are relatively limited because of the very low sensitivity. [ 17 ] In spite of some advances in this area, the pure sensing layers were still suffering from the considerable problems including poor selectivity and high limit of detection (LOD).…”