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Figure 2. Thermal conductive cooling materials and devices. (A) The optical path and heat flux between µ-ILED and µ-IPD on skin; (B) optoelectronic device structure for blood flow monitoring with metallic heat sink. Reproduced with permission^[46]. Copyright 2018, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim; (C) nanocomposite of aligned BNNS islands with porous PDMS foam; (D) cross-sectional SEM images of contact interface between s-BN islands and P-PDMS; (E) thermography of LED arrays on the double-layer s-BN/p-PDMS film. Reproduced with permission^[112]. Copyright 2021, Springer Nature; (F) conceptual view of thermal regulation textile. (G) a-BN/PVA fiber using a 3D-printing machine and various fabric structures. Reproduced with permission^[113]. Copyright 2017, American Chemical Society; (H) multilayer wearable strain sensor with TPU fibrous mats/graphene nanoribbons (GNRs)/TPU-boron nitride nanosheet (BNNS); (I) reliability test for temperature and resistance variations of the strain sensor mounted on the knee. Reproduced with permission^[115]. Copyright 2020, Springer Nature.