Carbon nanofiber with negative dielectric constant in microwave frequency band and preparation method and application thereof

• Main Authors: QIAN LEI, YUE KAICHENG, YAN ZHAOQIAN, SUN ZHIHAO, LI ANRAN, MA SHUANGQIAN
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2020
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; BASIC ELECTRIC ELEMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; ELECTRICITY; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; NATURAL OR ARTIFICIAL THREADS OR FIBRES; PHYSICS; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE; SPINNING; TESTING; TEXTILES; WAVEGUIDES

The present invention discloses carbon nanofiber with a negative dielectric constant in microwave frequency band and a preparation method and application thereof. The preparation method comprises thefollowing steps of performing freeze-drying on cellulose dispersion liquid, and then carrying out high-temperature carbonization, wherein the high temperature refers to the temperature not lower than1,100 DEG C. The carbon nanofiber provided by the present invention has the negative dielectric constant in the microwave frequency band, the dielectric constant can be regulated by changing the carbonization temperature, the preparation process is simple, and the cost is low. The carbon nanofiber provided by the present invention has the important use value and wide market prospect in applicationfields of electromagnetic wave absorption, electromagnetic shielding and the like. 本发明公开了微波频段具有负介电常数的碳纳米纤维及制备方法与应用，其制备方法为将纤维素分散液进行冷冻干燥，再进行高温碳化，所述高温指不低于1100℃的温度。本发明提供的碳纳米纤维在微波频段具有负介电常数，可通过改变碳化温度调控介电常数，制备工艺简单、成本低。本发明提供的碳纳米纤维在电磁波