Which one has better piezoresistive response...Single wall carbon nanotube (SWNT) or multiwall carbon nanotube (MWNT)
It depends to the chirality of CNTs. As demonstrated by several researchers, single SWCNT possesses higher piezoresisitivity. However, if you are talking about the thin film structure, piezoresisitive response of the entire thin film is as a function of our design, not piezoresisitivity of individual CNT. Check out my recent review paper for further information:
https://www.researchgate.net/publication/284720141_Stretchable_Skin-Mountable_and_Wearable_Strain_Sensors_and_Their_Potential_Applications_A_Review
Article Stretchable, Skin-Mountable, and Wearable Strain Sensors and...
Also the alignment of CNTs is an important aspect to get better piezoresistive response.
It is true, the piezoresistivity depends to several parameters such as alignment, lenght, density, interfacial binding between CNT and matrix, and even fabrication process. These are discussed with details in my recent review paper posted above.
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