ORCID Profile
0000-0001-6436-8312
Current Organisation
Deakin University
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Publisher: IOP Publishing
Date: 23-05-2019
Abstract: Graphene as a coating material that shows high impermeability as an excellent barrier in oxidation and corrosion protection has been reported to be less stable at elevated temperature. Sometimes the formed galvanic cell between the graphene and protective surface will even increase the corrosion speed. In comparison, boron nitride (BN), which shows the same impermeability with graphene, is believed to be a better coating material with its superior thermal and chemical inertness. In this study, an in situ synthesis of BN coatings, grown by boron ink, on both carbon and Cu for anti-oxidation and anti-corrosion purposes has been demonstrated. Thermogravimetric analysis and electrochemical analysis reveal that the BN coatings can effectively prevent the carbon from being oxidized at high temperature in air and adequately slow down the corrosion rate of Cu in sodium chloride solution, respectively. These results indicate that boron ink assisted in situ BN coating has high potential in the applications of oxidation and corrosion protection.
Publisher: American Chemical Society (ACS)
Date: 28-06-2017
Abstract: Detecting and monitoring varieties of human activities is one of the most essential functions and design purposes of different kinds of wearable sensors. Apart from excellent sensitivity and durability, limited by the materials, most of the sensors reported in the literature are capable of detecting signals only on the basis of a sole mechanism. In this work, a dual-mode flexible sensor derived from a high-temperature-pyrolysized 3D carbon sponge (C-Sponge) was proposed as a peculiar sensor material that is able to detect human activities based on fundamentally different mechanisms, by either the triboelectric effect or the piezoresistive effect. The sensor generated an average open circuit voltage up to ∼2 V and short circuit current up to ∼70 nA when being used as self-powered triboelectric sensor, which was sufficiently sensitive for detecting finger touching and plantar pressure distribution of human feet. On the other hand, by incorporating MWCNT into the 3D structure, the sensor at piezoresistive mode exhibited a sensitivity improvement of nearly 20-fold, from less than 40% to more than 800%, and a durability improvement of more than 22-fold (240 000 cycles) compared with those of original C-Sponge fabricated at 1000 °C (10 800 cycles). All the experimental results indicated that the proposed flexible dual-mode sensor is potentially applicable as wearable sensors for human activity monitoring.
Publisher: American Chemical Society (ACS)
Date: 10-03-2017
Abstract: The booming growth of flexible and stretchable electronic devices with increasing power and multifunctionalities calls for novel highly efficient thermal interface materials (TIMs) with versatile functions, such as high deformability and self-healing ability, whereas traditional metallic-based or grease-based ones could hardly provide. Herein, we report a highly flexible and self-healable dual-cross-linked hydrogel-based nanocomposite filled with hexagonal boron nitride (h-BN) nanosheets fabricated by in situ polymerization of acrylic acid (AA). The thermal conductivity of the composites can be tuned by adjusting both fraction of BNNSs and water content. Although a solid, the highly flexible characteristic of the developed TIMs enables a perfect ability to replicate the texture of a rough surface, which may greatly enhance thermal transfer between adjacent surfaces. By increasing the water content to soften the material, it can be recycled and reused for different kinds of rough surface. In addition, benefiting from the dual-cross-linked structure, the composites are capable of recovering both mechanical strength and thermal conductivity even from severe structural breakdowns, for ex le, three consecutive cutting and healing cycles. This study may pave the way to fabrication of multifunctional highly flexible TIMs, which may promote the development of heat dissipation materials.
Publisher: American Chemical Society (ACS)
Date: 13-09-2021
Publisher: Elsevier BV
Date: 2022
No related grants have been discovered for Hongbo Jiang.