Selective Detection of Ethylene by MoS2-Carbon Nanotube Networks Coated with Cu(I)-Pincer Complexes.,ACS Sensors

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Selective Detection of Ethylene by MoS2-Carbon Nanotube Networks Coated with Cu(I)-Pincer Complexes.
ACS Sensors ( IF 8.2 ) Pub Date : 2020-06-04 , DOI: 10.1021/acssensors.0c00344
Winston Yenyu Chen _{1,

2} , Aiganym Yermembetova _{1,

2} , Benjamin M Washer _{2,

3} , Xiaofan Jiang _{2,

4} , Shoumya Nandy Shuvo ₁ , Dimitrios Peroulis _{2,

4} , Alexander Wei _{1,

2,

3} , Lia A Stanciu _{1,

2}

Affiliation

The plant hormone ethylene (C2) can induce premature fruit ripening and flower senescence at levels below 1 ppm, which has motivated efforts to develop cost-effective methods for C2 monitoring during the transport and storage of climacteric fruits. Here, we describe a nanocomposite film composed of exfoliated MoS₂, single-walled carbon nanotubes (SCNTs), and Cu(I)–tris(mercaptoimidazolyl)borate complexes (Cu–Tm) for real-time detection of C2 at levels down to 100 ppb. A copercolation network of MoS₂ and SCNTs was deposited onto interdigitated Ag electrodes printed on plastic substrates and then coated with Cu–Tm with a final conductance in the 0.5 mS range. Reversible changes in relative conductance (−ΔG/G₀) were measured upon C2 exposure with a linear response at sub-ppm levels. The thin-film sensors were highly selective toward C2, and they responded weakly to other volatile organic compounds or water at similar partial pressures. A mechanism is proposed in which Cu–Tm behaves as a chemically sensitive n-type dopant for MoS₂, based on spectroscopic characterization and density functional theory modeling. Cu–Tm-coated MoS₂/SCNT sensors were also connected to a battery-powered wireless transmitter and used to monitor C2 production from various fruit samples, validating their utility as practical, field-deployable sensors.

中文翻译：

通过涂覆有Cu（I）-Pincer配合物的MoS2-碳纳米管网络选择性检测乙烯。

植物激素乙烯（C2）可以诱导低于1 ppm的果实过早成熟和花朵衰老，这促使人们开发出更具成本效益的方法，用于在更年期果实的运输和储存过程中监测C2。在这里，我们描述了一种由MoS ₂脱落，单壁碳纳米管（SCNTs）和Cu（I）–tris（巯基咪唑基）硼酸盐络合物（Cu–Tm）组成的纳米复合膜，用于实时检测C2的水平，直至100 ppb。MoS ₂和SCNTs的共渗网络沉积在印刷在塑料基板上的叉指式Ag电极上，然后以最终电导在0.5 mS范围内的Cu-Tm进行涂覆。在相对电导率可逆变化（-Δ ģ / g ^ ₀）是在C2暴露下以亚ppm级的线性响应测量的。薄膜传感器对C2的选择性高，并且在相似的分压下对其他挥发性有机化合物或水的响应较弱。基于光谱表征和密度泛函理论建模，提出了一种机制，其中Cu–Tm充当MoS ₂的化学敏感n型掺杂剂。涂有Cu–Tm的MoS ₂ / SCNT传感器还连接到电池供电的无线发射器，并用于监测各种水果样品中的C2产生，从而验证了它们作为实用的，可现场部署的传感器的效用。

更新日期：2020-06-26

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