Enhanced Gas‐Sensing Performances of Ru‐Loaded p‐Type Co₃O₄ Nanoparticles

Abstract

Co 3 O 4 nanoparticles (NPs) and Co 3 O 4 NPs-functionalized with 0.25, 0.50, and 1.00 wt.% Ruthenium (Ru) are synthesized by the precipitation and impregnation methods. X-ray diffraction data confirm that all samples are highly crystalline with a typical cubic Co 3 O 4 NPs structure. Electron microscopic images show spherical morphologies of Co 3 O 4 nanoparticles with the diameters of 10-30 nm and Ru nanoparticles with relatively small diameters of 2-4 nm loaded on Co 3 O 4 surfaces. The gas-sensing results reveal that Ru loading at an optimally low Ru content of 0.25 wt.% led to significantly enhanced ethanol sensing performances. Specifically, the 0.25 wt.%Ru/Co 3 O 4 sensor exhibits a good p-type response of %30 to 100 ppm C 2 H 5 OH, short response time (0.08 s), good recovery time (a few minutes) and high C 2 H 5 OH selectivity against H 2 S, H 2 , NH 3 , NO 2 , and SO 2 . Therefore, the Ru-loaded Co 3 O 4 sensor is a promising alternative p-type gas sensor for ethanol detection.

Advances in Noble Metal-Decorated Metal Oxide Nanomaterials for Chemiresistive Gas Sensors: Overview

“…Compared with other RT gas sensors, the as-prepared sensor has short response/recovery time of 0.52/9.39 s. The presence of the RuO 2 /Ru clusters makes the water molecules dissociate less, and the greater sensitivity is obtained. Kruefu et al [ 311 ] proposed Ru-loaded p-type Co 3 O 4 NPs gas sensor through the precipitation and impregnation methods. As shown in Fig.…”

Glucose-Assisted Synthesis of Porous, Urchin-like Co3O4 Hierarchical Structures for Low-Concentration Hydrogen Sensing Materials

“…Co 3 O 4 , as a p-type MOS with a spinel structure, is a promising gas-sensing material due to its high stability, good humidity resistance, and high catalytic activity [ 6 , 7 ]. However, Co 3 O 4 still suffers from having a high detection limit, low response, and poor selectivity.…”

Nanocomposite Co3O4-ZnO Thin Films for Photoconductivity Sensors

“…For successful application, Co 3 O 4 -ZnO films must be nanocrystalline and accounting for mass-scale production, and also the synthesis method must be simple, economical, and environmentally friendly to allow for cyclic production. In the literature, numerous protocols have been reported for deriving Co 3 O 4 -ZnO films, such as plasma-chemical vapor deposition (PE-CVD), chemical precipitation from solutions [ 8 , 9 ], laser deposition [ 5 ], sol-gel [ 10 , 11 ], solvothermal [ 12 ], electrochemical [ 13 ], hydrothermal [ 14 ], etc. However, most of these methods require expensive equipment, are time-consuming and energy-intensive procedures.…”