Supramolecular\nLuminescent Copper-Nanocluster-Based Dough with Excellent\nElectrical\nConductivity Sensing Properties

In\nrecent years, the rapid advancement of flexible conductive materials\nhas significantly increased the demand for dough materials that offer\nhigh flexibility and conductivity for diverse applications. Here,\nwe developed a flexible, stretchable, and self-healing dough utilizing\nhydrogen-bonding interactions between glutathione-stabilized copper\nnanoclusters (GSH-Cu NCs) and poly(acrylic acid) (PAA). The dough\nmaterials can be kneaded, readily reshaped, and further processed\nto create bulk materials of arbitrary form factors. The incorporation\nof PAA not only preserved the vibrant blue emission of GSH-Cu NCs\nbut also enhanced their electrical conductivity and stretchability.\nThe dough can be stretched up to 25 times its initial length and achieves\ncomplete self-healing in a short time. Moreover, the dough can automatically\nrepair physical damage and return to its initial conductivity levels\nafter healing. Surprisingly, the electrical conductivity of the dough\ncan reach as high as 2.97 S/m, which is relatively superior compared\nto that of conventional conductive materials. This study presents\na dough that serves as a highly sensitive strain sensor, capable of\neffectively monitoring human movement across a broad range of strains.