Electrochemically Exfoliated High-Quality 2H-MoS2 for Multiflake Thin Film Flexible Biosensors.,Small

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Electrochemically Exfoliated High-Quality 2H-MoS2 for Multiflake Thin Film Flexible Biosensors.
Small ( IF 13.0 ) Pub Date : 2019-04-29 , DOI: 10.1002/smll.201901265
Panpan Zhang _{1,

2} , Sheng Yang _{1,

2} , Roberto Pineda-Gómez ₃ , Bergoi Ibarlucea _{2,

3} , Ji Ma _{1,

2} , Martin R Lohe _{1,

2} , Teuku Fawzul Akbar ₃ , Larysa Baraban _{2,

3} , Gianaurelio Cuniberti _{2,

3} , Xinliang Feng _{1,

2}

Affiliation

2D molybdenum disulfide (MoS₂) gives a new inspiration for the field of nanoelectronics, photovoltaics, and sensorics. However, the most common processing technology, e.g., liquid‐phase based scalable exfoliation used for device fabrication, leads to the number of shortcomings that impede their large area production and integration. Major challenges are associated with the small size and low concentration of MoS₂ flakes, as well as insufficient control over their physical properties, e.g., internal heterogeneity of the metallic and semiconducting phases. Here it is demonstrated that large semiconducting MoS₂ sheets (with dimensions up to 50 µm) can be obtained by a facile cathodic exfoliation approach in nonaqueous electrolyte. The synthetic process avoids surface oxidation thus preserving the MoS₂ sheets with intact crystalline structure. It is further demonstrated at the proof‐of‐concept level, a solution‐processed large area (60 × 60 µm) flexible Ebola biosensor, based on a MoS₂ thin film (6 µm thickness) fabricated via restacking of the multiple flakes on the polyimide substrate. The experimental results reveal a low detection limit (in femtomolar–picomolar range) of the fabricated sensor devices. The presented exfoliation method opens up new opportunities for fabrication of large arrays of multifunctional biomedical devices based on novel 2D materials.

中文翻译：

用于多片薄膜柔性生物传感器的电化学剥离高质量2H-MoS2。

2D二硫化钼（MoS ₂）为纳米电子，光伏和传感技术领域提供了新的灵感。但是，最常见的处理技术（例如，用于设备制造的基于液相的可扩展剥落技术）导致许多缺点，阻碍了它们的大面积生产和集成。主要挑战与MoS ₂薄片的尺寸小和浓度低以及对它们的物理特性（例如，金属相和半导体相的内部异质性）的控制不足有关。在这里证明了大型半导体MoS ₂在非水电解液中，可以通过简便的阴极剥离方法获得最大尺寸为50 µm的纸张。合成过程避免了表面氧化，因此保留了具有完整晶体结构的MoS ₂薄板。它在概念验证级别得到了进一步证明，这是一种基于溶液处理的大面积（60×60 µm）柔性埃博拉生物传感器，基于MoS ₂薄膜（厚度为6 µm），该薄膜是通过将多个薄片重新堆叠而制成的。聚酰亚胺底物。实验结果表明，所制造的传感器设备的检测极限较低（在飞摩尔-皮摩尔范围内）。提出的剥离方法为基于新型2D材料的大型多功能生物医学设备的制造开辟了新的机遇。

更新日期：2019-04-29

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