With the large-scale application and high-speed operation of electronic equipment, the thermal diffusion problem presents an increasing requirement for effective heat dissipation materials. Herein, high thermal conductive graphite films were fabricated via the graphitization of polyimide (PI) films with different amounts of chemical catalytic reagent. The results showed that chemically imidized PI (CIPI) films exhibit a higher tensile strength, thermal stability, and imidization degree than that of purely thermally imidized PI (TIPI) films. The graphite films derived from CIPI films present a more complete crystal orientation and ordered arrangement. With only 0.72% chemical catalytic reagent, the graphitized CIPI film achieved a high thermal conductivity of 1767 W·m−1·K−1, which is much higher than that of graphited TIPI film (1331 W·m−1·K−1), with an increase of 32.8%. The high thermal conductivity is attributed to the large in-plane crystallite size and high crystal integrity. It is believed that the chemical imidization method prioritizes the preparation of high-quality PI films and helps graphite films achieve an excellent performance.
Nitrogen-doped cellulose-based
porous carbon materials were obtained
by hydrothermal method and KOH chemical activation together with melamine
as a nitrogen-doping precursor. The effects of hydrothermal temperature
on the microstructure and surface morphology of the products were
mainly studied. Also, the carbon dioxide adsorption capacity of the
prepared porous carbon was investigated. It was found that when the
hydrothermal carbonization temperature was 270 °C and the mass
ratio of cellulose and melamine was 1:1, the largest micropore specific
surface area of 1703 m2·g–1 and
micropore volume of 0.65 cm3·g–1 were obtained, with a nitrogen-doping composition of 1.68 atom %.
At the temperature of 25 °C and under the pressure of 0.1, 0.2,
0.3, and 0.4 MPa, the adsorption amount of CO2 was 1.56,
3.79, 5.42, and 7.34 mmol·g–1, respectively.
Also, the adsorption process of CO2 was in good accordance
with the Freundlich isotherm model.
We report on a nano-array sensor for hydrogen peroxide (H 2 O 2 ) that is based on a nanoporous anodic aluminum oxide template. This was used as a matrix for the co-immobilization of horseradish peroxidase (HRP) and methylene blue (MB) on the surface of an indium tin oxide electrode. The immobilized HRP retained its natural activity and MB is capable of efficiently shuttle electrons between HRP and the electrode. The new electrode was characterized by SEM and electrochemical methods. It exhibits fast response, long-term stability, high sensitivity and good selectivity to H 2 O 2 . Under optimized conditions, it linearly responds to H 2 O 2 in the concentration range from 1.0 μM to 26 mM, with a detection limit of 0.21 μM (at S/N03).
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