Highly Rapid and Sensitive Formaldehyde Detection at Room Temperature Using a ZIF-8/MWCNT Nanocomposite

Abstract

Formaldehyde is a volatile organic compound (VOC) with extensive applications, volatility, and toxicity, which have made it an important risk to human health even at low concentrations. Therefore, rapid detection of formaldehyde vapors in the environment is a necessity. Herein, we introduce a resistive gas sensor based on zeolitic imidazolate framework-8/multiwalled carbon nanotube (ZIF-8/MWCNT) for detection of formaldehyde vapors at room temperature. In this sensor, a low amount of MWCNTs was used in order to improve the electrical conductivity of the porous nanoparticles of ZIF-8. The sensor was fabricated by deposition of a thin layer of the nanocomposite onto interdigitated electrodes, and its sensing ability was investigated on exposure to formaldehyde vapors. The obtained sensor showed sensitive and fast responses to different concentrations of formaldehyde, and the sensor response to formaldehyde was higher than toward some other VOCs, including methanol, ethanol, acetone, and acetonitrile. Furthermore, because of the hydrophobic nature of ZIF-8, the effect of relative humidity on the gas-sensing performance was insignificant, which proves that this sensor is suitable for use under humid conditions.

Size Discrimination of Carbohydrates via Conductive Carbon Nanotube@Metal Organic Framework Composites

“…Several composites using multiwalled carbon nanotubes (MWCNT) have also been made for applications in water remediation. , Both traditional electrochemical sensing applications as well as electrocatalytic materials for OER/ORR /HER have been realized. Chemiresistive sensing for common VOCs have been another common target for this class of materials. , Gas storage and separation for CO 2 , and H 2 − have been other areas of study. Other energy storage applications including supercapacitors have seen initial exploration .…”

“…Chemiresistive sensing for common VOCs have been another common target for this class of materials. 50,51 Gas storage and separation for CO 2 52,53 and H 2 54−56 have been other areas of study. Other energy storage applications including supercapacitors have seen initial exploration.…”

Synthesis and H2S-Sensing Properties of MOF-Derived Cu-Doped ZnO Nanocages

“…The crystallinity of the as-synthesized samples was examined with XRD analyses. As shown in Figure 2 a, all the samples exhibited strong diffraction peaks, and the diffraction peaks in the spectra corresponded to the (110), (200), (211), (220), (310), and (222) reflections of ZIF-8, respectively [ 26 ]. No characteristic peaks of other impurities were observed in the XRD patterns.…”

On‐Site Detection for Hazardous Materials in Chemical Accidents

“…In addition, a surface plasmon‐enhanced optical sensor was prepared by the deposition of a mixture of semiconductor core‐shell quantum dots, fumed‐silica, and AuNPs on a silica‐sphere array which aimed for the HCHO detection (Figure 3(a)). 77 Based on either atomically dispersed Au on In 2 O 3 nanosheets, 78 or zeolitic imidazolate framework‐8/multiwalled carbon nanotube, 79 and colorimetric visualization using polymeric core–shell nanoparticles, 80 the nanosensor platforms were enhanced sensitivity for HCHO gas detection at room temperature. Hence, these approaches are promising for real‐time HCHO gas monitoring and can also be adapted to apply in many fields as well as HCHO gas sensor systems for indoor safety and industrial processing.…”