Fig. 2From: Synthesis, characterisation and cytotoxicity of gold microwires for ultra-sensitive biosensor developmenta The representative FESEM micrograph of the as-synthesised AuNWs. The enlarged figure (yellow rectangular) reveals the parallel self-assembly arrangement of close-packed AuNWs bundles. The small parallel bundle highlighted in yellow circle showed that the bundle of the microwires has a diameter size of ~ 200 nm. b The EDX spectrum analysis of the as-synthesised AuNWs recorded for the selected area of AuNWs (red rectangle) taken from image aBack to article page