For ZnO nanowire gas sensor, can we establish a relationship between gas sensitivity and aspect ratio (length and diameter) mathematically? I found one paper: http://www.sciencedirect.com/science/article/pii/S0925400509008077 ; can anyone give some detail information please?
The morphology (length and diameter) of the nanowires plays a crucial role on the functionality of the ZnO nanowires. The main reason is that altering the aspect ratio of the nanowires will change the surface area. That means the amount of the gas atoms that interact with the surface of the ZnO will be changed. However, nanowires with smaller diameter will have a better penetration that influence the adsorption and desorption. I believe you need to have two variables: one for diameter and one for length of nanowires and my guess is high aspect ratio nanowires will be better gas sensors.
Hi Murugathas, very interesting, if it is published, please provide the link for studies.