One-pot bottom-up fabrication of a 2D/2D heterojuncted nanozyme towards optimized peroxidase-like activity for sulfide ions sensing
One-pot bottom-up fabrication of a 2D/2D heterojuncted nanozyme towards optimized peroxidase-like activity for sulfide ions sensing
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DOI：
10.1016/j.snb.2019.127565
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发表时间：
2020-03-01
影响因子：
8.4
通讯作者：
Wang, Jianlong
中科院分区：
文献类型：
--
作者：
Liu, Xinnan;Huang, Lunjie;Wang, Jianlong
由于缺乏具有理想催化活性的简单合成方法，基于袖口边缘纳米酶的快速检测策略仍然受到显着限制。在这方面，2D纳米酶由于其独特的酶模拟特性而最近成为一组有前途的纳米酶。在此，通过一锅自底向上共煅烧，我们报告了一个强大的策略，以促进过氧化物酶样活性的二维纳米酶，通过合理的制造2D/2D异质结纳米酶：二硫化钼/g-C3 N4异质结纳米片（：二硫化钼/g-C3 N4 HN）。由于2D/2D：MoS 2/g-C3 N4异质结纳米酶具有电子传递加速、协同效应以及对催化底物的高亲和力等优点，其表现出比纯g-C3 N4纳米片和MoS 2纳米片更强的过氧化物酶样活性。作为概念验证应用，开发了基于这种2D/2D异质结纳米酶的比色传感器来检测硫离子（S2-），发现检测限低至37 nM。因此，目前的工作不仅展示了提高2D纳米酶活性的强大策略，而且还建立了一种用于水安全监测的简便方法。
The cuffing-edge nanozyme-based strategy for rapid detection remains significantly limited by the lack of simple synthetic method with ideal catalytic activity. In this regard, 2D nanozymes has recently emerged as a group of promising nanozymes because of their unique enzyme mimicking properties. Herein, via one-pot bottom-up co-calcination, we report a robust strategy to promote the peroxidase-like activity of 2D nanozyme by rational fabricating a 2D/2D heterojuncted nanozyme: MoS2/g-C3N4 heterojuncted nanosheets (: MoS2/g-C3N4 HNs). With merits of the acceleration of electron transfer and the synergistic effect of MoS2 and g-C3N4 as well as high affinity to the catalytic substrates, the 2D/2D: MoS2/g-C3N4 heterojuncted nanozyme shows enhanced peroxidase-like activity over the pure g-C3N4 nanosheets and MoS2 nanosheets. As a proof-of-concept application, a colorimetric sensor based on this 2D/2D heterojuncted nanozyme was developed to detect sulfide ions (S2-), and the detection limit was found to be as low as 37 nM. Therefore, the current work not only demonstrates a powerful strategy to improve the activity of 2D nanozymes but also establish a facile approach for water-safety monitoring.