The effects of carbonization temperature on the properties and structure of PAN‐based activated carbon hollow fiber

Panahi

et al. 2019

Fibers

In this work, iron oxide nanoparticle loaded carbon fibers were prepared by electrohydrodynamic co-casting a polymer and particle mixture followed by carbonization. The precursor used to generate carbon fibers was a linear molecular chain polymer: polyacrylonitrile (PAN). A solution containing iron (II, III) oxide (Fe3O4) particles and the PAN polymer dissolved in dimethylformamide (DMF) was electrohydrodynamically co-cast into fibers. The fibers were stabilized in air and carbonized in hydrogen at elevated temperatures. The microstructure and composition of the fibers were analyzed using scanning electron microscopy (SEM). A quantitative metallographic analysis method was used to determine the fiber size. It was found that the iron (II, III) oxide particles distributed uniformly within the carbonized fibers. Photosensitivity of the particle containing fibers was characterized through measuring the open circuit potential of the fiber samples under the visible light illumination. Potential applications of the fibers for photovoltaics and photonic sensing were discussed.

Section: Structure Of the Composite Fibersupporting

confidence: 69%

Processing Iron Oxide Nanoparticle-Loaded Composite Carbon Fiber and the Photosensitivity Characterization

Panahi

et al. 2019

Fibers

“…[34][35][36]. Some oxygen in the functional groups such as ¼O and -OH are encapsulated into the backbone [37,38]. The quantitative results from the elemental analysis are shown in Table 1.…”

Section: Energy Conversion Propertymentioning

confidence: 99%

Electrohydrodynamic Casting Bismuth Telluride Microparticle-Loaded Carbon Nanofiber Composite Material With Multiple Sensing Functions

Chen

Journal of Micro and Nano-Manufacturing

et al. 2017

In this work, an electrohydrodynamic casting approach was used to manufacture a carbon nanofiber (CNF) composite material containing bismuth telluride (Bi2Te3) particles. A 10% polyacrylonitrile (PAN) polymer solution was taken as the precursor to generate nanofibers. Bismuth telluride microparticles were added into the polymer solution. The particle-containing solution was electrohydrodynamically cast onto a substrate to form a PAN-based nanofiber composite mat. High temperature heat treatment on the polymeric matrix composite mat in hydrogen atmosphere resulted in the formation of a microparticle-loaded CNF composite material. Scanning electron microscopic (SEM) analysis was conducted to observe the morphology and reveal the composition of the composite material. Energy conversion functions in view of converting heat into electricity, electromagnetic wave energy into heat, and photon energy into electricity were shown. Strong Seebeck effect, hyperthermia, and photovoltaics of the composite mat were found. In addition, the potential applications as sensors were discussed.

J of Applied Polymer Sci

“…As can be seen, I D /I G value increases with the rising heating temperature, which is contrary to the commonly used TK equation 14 because higher carbonization temperature always causes larger graphite crystalline size. 8,15…”

Section: Articlementioning

confidence: 99%

X‐band dielectric and microwave‐absorbing properties of the incompletely carbonized polyacrylonitrile cloth

Huang

Kang

Tang

et al. 2012

Incompletely carbonized polyacrylonitrile (PAN) cloths were prepared by heating stabilized PAN cloth at 600–800°C in different atmosphere. Their X‐band dielectric and microwave‐absorbing properties were investigated. Results showed that the complex permittivity constantly increased with the increasing heating temperature due to the growth of carbon sheets. Conversely, the cloths carbonized in air exhibit lower complex permittivity than those carbonized in nitrogen because the reaction with oxygen restricts the progress of carbonization. The reflection loss below −10 dB can be obtained in X band for the sample carbonized at 650°C for 2 h in air. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013