Hexagonal boron nitride nanosheets (BNNS) have been widely investigated as promising fillers for thermal composites because of its high thermal conductivity and electrical insulation, which avoid the short circuit risk effectively when applied in electronics. However, the poor dispersibility and weak interaction with matrix have hindered the further improvement of BNNS based thermal composites. Here, we propose a simple and green amino acid-assisted ball milling exfoliation process for highly hydrophilic glycine (NH₂-CH₂-COOH)-functionalized BNNS (BNNS-Gly) to improve their dispersion and reduce the thermal interface resistance between fillers and matrix. Three different types of thermal management materials have been prepared by dispersing BNNS-Gly into water, epoxy resin, and cellulose respectively, and their thermal properties have been investigated. As a result, the BNNS-Gly water nanofluid exhibits a 110% increment in thermal conductivity at 1.6 vol% loading compared with pure water. For BNNS-Gly/Epoxy composite, an enhancement of 109% of thermal conductivity compared with pure BNNS/Epoxy is achieved. According to the calculation of the Maxwell-Garnett effective medium theory (EMT) model, the thermal interface resistance between BNNS and epoxy is reduced 62% by our method. Besides, the thermal conductivity of BNNS-Gly/cellulose nanofiber (CNF) film reaches up to 16.2 W/mK at 70 wt% loading, which is 1.8-fold of that for BNNS/CNF. In summary, BNNS-Gly fabricated by this work show great advantages in thermal properties compared with widely-used pure BNNS based composite for improved dispersibility and enhanced interaction with matrix.

六方氮化硼纳米片（BNNS）由于其高导热性和电绝缘性而被广泛用作热复合材料的有希望的填料，当应用于电子产品时，可以有效避免短路风险。然而，差的分散性和与基质的弱相互作用阻碍了基于BNNS的热复合材料的进一步改进。在这里，我们提出了一种简单且绿色的氨基酸辅助球磨剥落工艺，用于高亲水性甘氨酸（NH ₂ -CH ₂-COOH）功能化的BNNS（BNNS-Gly），以改善其分散性并降低填料与基质之间的热界面电阻。通过将BNNS-Gly分别分散在水，环氧树脂和纤维素中，制备了三种不同类型的热管理材料，并对其热性能进行了研究。结果，与纯水相比，BNNS-Gly水纳米流体在1.6体积％的负载下导热率增加了110％。与纯BNNS /环氧树脂相比，BNNS-Gly /环氧树脂复合材料的导热系数提高了109％。根据麦克斯韦-加纳特有效介质理论（EMT）模型的计算，通过我们的方法，BNNS和环氧树脂之间的热界面电阻降低了62％。除了，BNNS-Gly /纤维素纳米纤维（CNF）薄膜的热导率在70 wt％的负载下达到16.2 W / mK，是BNNS / CNF的1.8倍。总之，与广泛使用的纯BNNS基复合材料相比，通过这项工作制造的BNNS-Gly在热性能方面显示出巨大的优势，从而改善了分散性并增强了与基体的相互作用。