采用液相超声剥离法,以两种微米级的六方氮化硼(h-BN)为原料,使用异丙醇/水共溶剂进行纳米氮化硼片(BNNS)剥离。利用紫外可见光分光光度计考察了共溶剂配方对BNNS剥离浓度的影响。通过扫描电子显微镜、透射电子显微镜、动态光散射纳米粒度仪和激光闪射导热仪,研究不同尺寸h-BN原料对剥离得到BNNS的平均尺寸和尺寸分布的影响,并考察了BNNS含量对BNNS/纳米纤维素(NFC)复合膜导热性能的影响。结果表明,使用1～2μm的h-BN剥离制备的BNNS/NFC复合膜热导率在BNNS添量为55%时达到最大值19.04W/(m·K),为纯NFC的11.9倍,大于相同BNNS添量下30μm的h-BN剥离制备的BNNS/NFC复合膜热导率[15.04W/(m·K)]。
Liquid phase ultrasonic exfoliating method was used to prepare BNNS with two sizes of h-BN and IPA/water co-solvent.The effect of co-solvent formulation on BNNS concentration was investigated by UV-Vis spectrophotometer.The influence of size of h-BN raw materials on the average size and size distribution of the separated BNNS and the thermal conductivity of the BNNS/NFC composite film was studied by means of scanning electron microscope (SEM),transmission electron microscope (TEM),dynamic light scattering nanometer particle size meter and laser flash thermal conductivity meter.The results showed that the thermal conductivity of the BNNS/NFC prepared by 1～2μm h-BN reached a maximum value of 19.04W/(m·k) when the BNNS addition was 55%,11.9 times that of the pure NFC,which was larger than that of 15.04W/(m·k) prepared by 30μm h-BN.
[1] 何立发,文伟峰,朱贵娥,等.5G通讯对移动通讯终端用电路板技术的新挑战[J].电子元器件与信息技术,2019,3(8):43-45.
[2] 孙川,邱学青,覃发梅,等.六方氮化硼的液相剥离及其在电子器件热管理应用的研究进展[J].材料工程,2019,47(12):21-32.
[3] 杨雅萍,李斌,张长瑞,等.类石墨烯结构二维氮化硼材料:结构特性、合成方法、性能及应用[J].材料导报,2016,30(11):143-148.
[4] Rafiei-Sarmazdeh Z,Jafari S H,Ahmadi S J,et al.Large-scale exfoliation of hexagonal boron nitride with combined fast quenching and liquid exfoliation strategies[J].Journal of Materials Science,2016,51(6):3162-3169.
[5] Wang Y,Xu L,Yang Z,et al.High temperature thermal management with boron nitride nanosheets[J].Nanoscale,2018,10(1):167-173.
[6] Zhu H,Li Y,Fang Z,et al.Highly thermally conductive papers with percolative layered boron nitride nanosheets[J].ACS Nano,2014,8(4):3606-3613.
[7] Luo W,Wang Y,Hitz E,et al.Solution processed boron nitride nanosheets:synthesis,assemblies and emerging applications[J].Advanced Functional Materials,2017,27(31):1701450.
[8] Gao Y,Ren W,Ma T,et al.Repeated and controlled growth of monolayer,bilayer and few-layer hexagonal boron nitride on Pt foils[J].ACS Nano,2013,7(6):5199-5206.
[9] Yao Y,Zeng X,Wang F,et al.Significant enhancement of thermal conductivity in bioinspired freestanding boron nitride papers filled with graphene oxide[J].Chemistry of Materials,2016,28(4):1049-1057.
[10] Wang Y,Shi Z,Yin J.Boron nitride nanosheets:large-scale exfoliation in methanesulfonic acid and their composites with polybenzimidazole[J].Journal of Materials Chemistry,2011,21(30):11371-11377.
[11] Marsh K,Souliman M,Kaner R B.Co-solvent exfoliation and suspension of hexagonal boron nitride[J].Chemical Communications,2015,51(1):187-190.
[12] Zeng X,Sun J,Yao Y,et al.A combination of boron nitride nanotubes and cellulose nanofibers for the preparation of a nanocomposite with high thermal conductivity[J].ACS Nano,2017,11(5):5167-5178.
[13] 刘光启.化学化工物性数据手册(无机卷)[M].北京:化学工业出版社,2002:348-349.
[14] Coleman J N,Lotya M,O'Neill A,et al.Two-dimensional nanosheets produced by liquid exfoliation of layered materials[J].Science,2011,331(6017):568-571.
[15] Wu K,Fang J,Ma J,et al.Achieving a collapsible,strong,and highly thermally conductive film based on oriented functionalized boron nitride nanosheets and cellulose nanofiber[J].ACS Applied Materials & Interfaces,2017,9(35):30035-30045.
[16] Jo I,Pettes M T,Kim J,et al.Thermal conductivity and phonon transport in suspended few-layer hexagonal boron nitride[J].Nano Letters,2013,13(2):550-554.
