Optimization of Carbon Nanotube-Coated Monolith by Direct Liquid Injection Chemical Vapor Deposition Based on Taguchi Method

Abstract

Carbon nanotubes (CNTs) have the potential to act as a catalyst support in many sciences and engineering fields due to their outstanding properties. The CNT-coated monolith was synthesized over a highly active Ni catalyst using direct liquid injection chemical vapor deposition (CVD). The aim was to study the optimum condition for synthesizing CNT-coated monoliths. The Taguchi method with L9 (34) orthogonal array design was employed to optimize the experimental conditions of CNT-coated monoliths. The design response was the percentage of carbon yield expressed by the signal-to-noise (S/N) value. The parameters including the mass ratio of Ni to citric acid (Ni:CA) (A), the injection rate of carbon source (B), time of reaction (C), and operating temperature (D) were selected at three levels. The results showed that the optimum conditions for CNT-coated monolith were established at A1B2C1D2 and the most influential parameter was D followed by B, C, and A. The ANOVA analysis showed the design was significant with R-squared and standard deviation of the factorial model equal to 0.9982 and 0.22, respectively. A confirmation test was conducted to confirm the optimum condition with the actual values of the average percentage of carbon yield deviated 1.4% from the predicted ones. The CNT-coated monoliths were characterized by various techniques such as field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Raman spectroscopy.

Secured Nanosynthesis–Deposition Aerosol Process for Composite Thin Films Incorporating Highly Dispersed Nanoparticles

“…On the other hand, Direct Liquid Injection (DLI) is a technology for feeding atomic layer deposition (ALD), chemical vapor deposition (CVD), and plasma enhanced‐chemical vapor deposition (PE‐CVD) [ 29 , 30 , 31 ] with chemical precursors. DLI enables the spraying of NP‐charged suspensions in the form of liquid droplets in dry processes.…”

Effects of total pressure on carbon nanotube synthesis, independent of feed pressure

“…These properties, including mechanical strength [2], electrical/thermal conductivity [3], and surface area [4], could open new horizons in the fabrication of various materials such as adsorbents [5], composites [6], and wearable electronics [7]. The above properties could be improved by optimising the CNT growth parameters [8][9][10], which was investigated in our previous work [11]. We determined the temperature-concentration locus of the high-quality and high-quantity grown CNTs across the growth regimes proposed by Lebedeva et al [12].…”

Anion-Regulated Synthesis of ZnO 1D Necklace-Like Nanostructures with High Photocatalytic Activity

“…The specific micromorphology induces the fundamental studies in mesoscopic physics and technological applications. Throughout the 1D nanomaterials, carbon group [ 2 , 3 ], III–V group [ 4 ], II–VI group, and oxide group materials [ 5 , 6 ] are hot fields to be investigated and synthesized. In particular, the 1D nanoscale metal oxide semiconductors have attracted considerable attention within the past decades owing to their dimensionality-dependent physical properties in fabricating high performance electronic, magnetic, and optoelectronic devices.…”