研究目的
To fabricate pony-size silver nanoparticles decorated boron nitride nanotube (BNNT) hybrids simply to improve thermal conductivity by reducing interfacial thermal resistance (ITR) between fillers at a high filler content.
研究成果
The study successfully prepared silver nanoparticles decorated boron nitride nanotube hybrids (AgNP-BNNT) by surface chemical reduction, which can reduce ITR between BNNT at high filler contents. Appropriate silver nanoparticles doping level improves the thermal conductivity of their nanocomposites. This strategy is viable for preparing metal nanoparticles-fillers for highly thermal conductivity applications.
研究不足
The size of AgNP increases with the doping level, which can broaden the gap between fillers and enhance the ITR between fillers. Excessive Ag loading content can lead to agglomeration of AgNP, affecting the thermal conductivity.
1：Experimental Design and Method Selection:
The study employs a facile synthesis method for decorating BNNT hybrids with AgNP by replacing between the Ag+ and -OH on the defect sites of BNNT.
2：Sample Selection and Data Sources:
BNNT with an average length of
3：54 um and an average diameter of 4 nm were used. List of Experimental Equipment and Materials:
Materials include BNNT, CNF, silver nitrate, sodium borohydride, and isopropyl alcohol. Equipment includes FEI Tecnai G2 F20 transmission electron microscope, FEI Nova NanoSEM 450 field emission scanning electron microscopy, Bruker VERTEX70 FTIR spectrometer, UNICAN UV-500 spectrophotometer, and thermal conductivity measuring apparatus (LW-9389).
4：9). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The process involves mixing AgNO3 solution, sodium citrate dehydrate solution, and sodium borohydride in a BNNT isopropyl alcohol mixed liquor, stirring for one hour in an ice-bath condition, and then filtrating to gain the sample.
5：Data Analysis Methods:
The study uses XPS and FTIR to prove the formation mechanism of AgNP-BNNT hybrids and UV-visible absorption spectroscopy to calculate the optical energy gap.
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FEI Tecnai G2 F20 transmission electron microscope
G2 F20
FEI
Used to test TEM images of BNNT and AgNP-BNNT hybrids.
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FEI Nova NanoSEM 450 field emission scanning electron microscopy
Nova NanoSEM 450
FEI
Used to characterize SEM images.
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Bruker VERTEX70 FTIR spectrometer
VERTEX70
Bruker
Used to test FTIR spectrum.
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Kratos Axis Ultra DLD
Axis Ultra DLD
Kratos
Used for XPS analysis.
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BNNT
Nanjing xfnano Co., Ltd. China
Used as a filler to improve thermal conductivity in polymer composites.
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CNF
Tianjin Haojiao Cellulose Co., Ltd, China
Used in combination with AgNP-BNNT to test the heat-conducting property of nanocomposites.
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Silver nitrate
Aladdin Chemistry Co., Ltd., China
Used in the preparation of AgNP-BNNT hybrids.
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Sodium borohydride
Aladdin Chemistry Co., Ltd., China
Used in the preparation of AgNP-BNNT hybrids.
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Isopropyl alcohol
Aladdin Chemistry Co., Ltd., China
Used as a solvent in the preparation of AgNP-BNNT hybrids.
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UNICAN UV-500 spectrophotometer
UV-500
UNICAN
Used to test UV-vis absorption spectroscopy.
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Thermal conductivity measuring apparatus
LW-9389
Used to measure the out-of-plane thermal diffusivity of the composites.
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