Jeevanandham Sampathkumar, Kochhar Dakshi, Agrawal Omnarayan, Pahari Siddhartha, Kar Chirantan, Goswami Tamal, Sulania Indra, Mukherjee Monalisa
Amity Institute of Click Chemistry Research and Studies, Amity University Uttar Pradesh Noida 201301 India
Department of Chemical Engineering & Applied Chemistry 200 College Street Toronto ON M5S 3E5 Canada.
Nanoscale Adv. 2024 Mar 28;6(9):2390-2406. doi: 10.1039/d4na00076e. eCollection 2024 Apr 30.
The delicate synthesis of one-dimensional (1D) carbon nanostructures from two-dimensional (2D) graphene moiré layers holds tremendous interest in materials science owing to its unique physiochemical properties exhibited during the formation of hybrid configurations with sp-sp hybridization. However, the controlled synthesis of such hybrid sp-sp configurations remains highly challenging. Therefore, we employed a simple hydrothermal technique using agro-industrial waste as the carbon source to synthesize 1D carbyne nanocrystals from the nanoconstricted zones of 2D graphene moiré layers. By employing suite of characterization techniques, we delineated the mechanism of carbyne nanocrystal formation, wherein the origin of carbyne nanochains was deciphered from graphene intermediates due to the presence of a hydrothermally cut nanoconstriction regime engendered over well-oriented graphene moiré patterns. The autogenous hydrothermal pressurization of agro-industrial waste under controlled conditions led to the generation of epoxy-rich graphene intermediates, which concomitantly gave rise to carbyne nanocrystal formation in oriented moiré layers with nanogaps. The unique growth of carbyne nanocrystals over a few layers of holey graphene exhibits excellent paramagnetic properties, the predominant localization of electrons and interfacial polarization effects. Further, we extended the application of the as-synthesized carbyne product (Cp) for real-time electrochemical-based toxic metal (As) sensing in groundwater samples (from riverbanks), which depicted superior sensitivity (0.22 mA μM) even at extremely lower concentrations (0.0001 μM), corroborating the impedance spectroscopy analysis.
从二维（2D）石墨烯莫尔层精细合成一维（1D）碳纳米结构，因其在形成具有sp-sp杂化的混合构型过程中展现出独特的物理化学性质，在材料科学领域备受关注。然而，可控合成这种混合sp-sp构型仍然极具挑战性。因此，我们采用一种简单的水热技术，以农业工业废料作为碳源，从二维石墨烯莫尔层的纳米收缩区域合成一维卡宾纳米晶体。通过一系列表征技术，我们阐述了卡宾纳米晶体的形成机制，其中卡宾纳米链的起源是由于在取向良好的石墨烯莫尔图案上存在水热切割纳米收缩机制，从而从石墨烯中间体中解析出来。在可控条件下，农业工业废料的自生水热加压导致生成富含环氧基的石墨烯中间体，这随之在具有纳米间隙的取向莫尔层中引发了卡宾纳米晶体的形成。卡宾纳米晶体在几层多孔石墨烯上的独特生长表现出优异的顺磁性质、电子的主要局域化以及界面极化效应。此外，我们将合成的卡宾产物（Cp）应用于基于电化学实时检测河岸地下水样品中的有毒金属（As），即使在极低浓度（0.0001 μM）下，其仍表现出卓越的灵敏度（0.22 mA μM），这与阻抗谱分析结果相符。
