To facilitate printable sensing solutions particles need to be suspended and stabilised in a liquid medium. Hansen parameters were used to identify that alcohol–water blends are ideal for stabilising colloidal copper hydroxide in dispersion. The suspended material can be further separated in various size fractions with a distinct cuboid geometry which was verified using atomic force microscopy. This facilitates the development of Raman spectroscopic metrics for determining particle sizes. This aspect ratio is related to the anisotropic crystal structure of the bulk crystallites. As the size of the nanocuboids decreases electrochemical sensitivity of the material increases due to an increase in specific surface area. Electrochemical glucose sensitivity was investigated using both cyclic voltammetry and chronoamperometry. The sensitivity is noted to saturate with film thickness. The electrochemical response of 253 mA M⁻¹ cm⁻² up to 0.1 mM and 120 mA cm⁻² up to 0.6 mM allow for calibration of potential devices. These results indicate suitability for use as a glucose sensor and, due to the surfactant-free, low boiling point solvent approach used to exfoliate the nanocuboids, it is an ideal candidate for printable solutions. The ease of processing will also allow this material to be integrated in composite films for improved functionality in future devices.

中文翻译：

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不含表面活性剂的液体剥落的氢氧化铜纳米立方体，用于非酶促电化学葡萄糖检测。

为了促进可打印的传感溶液，需要将颗粒悬浮并稳定在液体介质中。汉森参数用于确定醇水混合物是稳定分散体中胶体氢氧化铜的理想选择。悬浮的材料可以进一步分离为具有独特长方体几何形状的各种尺寸分数，这已通过原子力显微镜验证。这促进了用于确定粒径的拉曼光谱度量的发展。该纵横比与块状微晶的各向异性晶体结构有关。随着纳米立方体尺寸的减小，由于比表面积的增加，材料的电化学敏感性增加。使用循环伏安法和计时电流法对电化学葡萄糖敏感性进行了研究。注意到灵敏度随着膜厚度而饱和。253 mA M的电化学响应最高0.1 mM的^-1 cm ^-2和最高0.6 mM的120 mA cm ^-2允许对潜在器件进行校准。这些结果表明适合用作葡萄糖传感器，并且由于采用了无表面活性剂，低沸点溶剂的方法来剥落纳米立方，因此，它是可印刷溶液的理想选择。易于加工还将使这种材料集成在复合膜中，以改善未来设备的功能。