Heterostructured Co₃O₄/PEI–CNTs composite: fabrication, characterization and CO gas sensors at room temperature

Abstract

A noncovalent chemical approach is developed for hybridizing PEI–CNTs with Co3O4 nanoparticles. The Co3O4/PEI–CNTs composite sensor exhibits excellent sensing properties at room temperature to CO detection.

A Polymer‐Oriented Self‐Assembly Strategy toward Mesoporous Metal Oxides with Ultrahigh Surface Areas

“…For MT1.0, the characteristic absorptions of FT‐IR spectra (Figure c) at 3241 and 1620 cm −1 could be assigned to the stretching vibrations of NH groups. The peaks at 1047 cm −1 could be attributed to the C–N stretching vibrations . The solid‐state 13 C NMR spectroscopy (Figure d) showed the resonance peaks at 38.7, 41.3, and 68.5 ppm, which matched the methylene groups adjacent to primary, secondary, and tertiary amine groups, respectively.…”

Controllable synthesis of Co3O4/polyethyleneimine-carbon nanotubes nanocomposites for CO and NH3 gas sensing at room temperature

“…Similar to CoPCNTs-160, there are many defects existed in the samples between Co 3 O 4 NPs and CNTs. Those linear and planar defects may caused by PEI [28].…”

“…Because in the precursor solution, the Co 2+ are well-distributed assembled the polymer chains with amino groups. The hydrothermal synthesis of CoPCNTs nanocomposites was adapted from Dang et al with some modifications [28]. In our preparation method, the oxidizing agent was changed to H 2 O 2 .…”

Carbon Nanotube Based Gas Sensors toward Breath Analysis

“…Dang et al. showed that, by first noncovalently attaching PEI to oxidized CNTs, Co 3 O 4 NPs could be synthesized on CNT sidewalls hydrothermally starting from the precursor Co(NO 3 ) 2 . The Co 3 O 4 NPs are 4–8 nm in diameter and serve as CO receptors, achieving sensitivity down to 5 ppm.…”