▲ Vol 385 Issue 6704 |  05 July, 2024

Ultrastrong MXene film induced by sequential bridging with liquid metal

Wei Li, TianZhu Zhou, ZeJun Zhang, Lei Li, WangWei Lian, YanLei Wang, JunFeng Lu, Jia Yan, HuaGao Wang, Lei Wei, and QunFeng Cheng

Nanoscale materials can have outstanding properties, but it can be challenging to assemble them into larger fibers or sheets while retaining their intrinsic capabilities. For example, MXene nanosheets have excellent mechanical and electrical properties that are promising for flexible electronic devices and aerospace applications. Li et al. fabricated MXene films at room temperature using bacterial cellulose and liquid metal to sequentially bridge the nanosheets. The orientation of the MXene nanosheets was dramatically improved by the blade-coating layer-by-layer process, and the liquid metal effectively filled any voids. The interfacial interactions between sheets were also improved by hydrogen bonding from the bacterial cellulose and coordination bonding with the liquid metal, enhancing the stress transfer efficiency. —Marc S. Lavine

https://www.science.org/doi/10.1126/science.ado4257

▲ Vol 03 Issue 03 |  13 July, 2024

Design of narrow bandgap Fe2O3/MoO3 heterostructure for boosting triethylamine sensing performance

Shuai Zhang, Qi Wang, Peng Song

To achieve the rapid and real-time detection of triethylamine (TEA) gas, this study synthesized a gas sensor based on heterostructures of Fe2O3/MoO3 using a hydrothermal method. Fe2O3/MoO3 composites with a narrow bandgap (1.1 eV) were successfully synthesized by constructing heterostructures. The rapid and efficient detection of triethylamine was achieved at 220 °C. The response and response/recovery times of the Fe2O3/MoO3 sensor with 50 × 10−6 triethylamine were 132 s and 5 s/10 s, respectively. The Fe2O3/MoO3 sensor maintained a good response to triethylamine gas, even at 80% relative humidity. The sensing mechanism of the Fe2O3/MoO3 sensor can be described in terms of adsorption energy and electronic behavior of the sensing layer using density functional theory (DFT). The results are consistent with the excellent selectivity and rapid response/recovery of the Fe2O3/MoO3 gas sensor for triethylamine. Therefore, the construction of heterostructures to facilitate electron transmission is an effective strategy to achieve rapid detection of triethylamine and is worthy of further exploration and investigation.

https://www.sciencedirect.com/science/article/pii/S2772571524000147

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