Abstract
The flocculation of small surficial groups on pristine CNCs (carbon nanocoils) bundles limit their application. In this study, we designed and fabricated novel array CNCs with a surficial decoration of polyaniline (PANI) using in situ methods. Atomic layer deposition (ALD) and chemical vapor deposition (CVD) methods were employed to fabricate the highly pure array CNCs. The array CNCs decorated with ultra-thin PANI were confirmed by different characterizations. Furthermore, this material displayed a good performance in its detection of formaldehyde. The detection results showed that the CNCs coated with PANI had a low limit of detection of HCHO, as low as 500 ppb, and the sensor also showed good selectivity for other interfering gases, as well as good repeatability over many tests. Furthermore, after increasing the PANI loading on the surface of the CNCs, their detection performance exhibited a typical volcanic curve, and the value of the enthalpy was extracted by using the temperature-varying micro-gravimetric method during the process of detection of the formaldehyde molecules on the CNCs. The use of array CNCs with surficial decoration offers a novel method for the application of CNCs and could be extended to other applications, such as catalysts and energy conversion.
Highlights
As an important carbon material, carbon nanocoils (CNCs) have attracted increasing attention in the study of catalysis templates, wave-absorption and energy conversionstorage due to their unique geometrical and mechanical elegance, light weight, good stability, and electrical properties [1,2,3,4]
The element mapping, X-ray photoelectron spectra (XPS), attenuated total reflection spectra (ATR)-IR and XRD results confirmed the successful decoration of the ultra-thin layer of the PANI on the CNCs
The detection limit of the sensor for formaldehyde was lower than 500 ppb
Summary
As an important carbon material, carbon nanocoils (CNCs) have attracted increasing attention in the study of catalysis templates, wave-absorption and energy conversionstorage due to their unique geometrical and mechanical elegance, light weight, good stability, and electrical properties [1,2,3,4]. Carbon nanocoils have exhibited their application potential in terms of the advantages they offer in the design of electromagnetic wave absorbers, flat-panel displays, and catalysis templates [5]. There are few studies about their application in gas sensors. Quartz crystal microbalance (QCM), which offers advantages such as high sensitivity, low working temperature, high portability and low power consumption, offers a novel direction for the application of CNCs in gas sensors [6,7].
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