Localized surface plasmon resonance (LSPR) is an optical phenomenon generated by the collective oscillation of surface free electrons in a nanoscale level. The strong light-matter interaction at the resonance frequencies creates intense electromagnetic field around plasmonic metal nanostructures, allowing our group to develop numerous plasmonic metal nanostructures with various morphology as a promising platform for diverse optical applications, such as Surface enhanced Raman scattering (SERS), refractive-index-based sensing, etc. Leveraging our strategies used in building hierarchical multi-dimensional nanoarchitectures, we are currently working on the synthesis of state-of-the-art metal nanostructures with superior plasmonic performance by their so-called ‘hot spots’. A wide range of sensing applications, including single molecule detection, spectroelectrochemistry, in-situ reaction monitoring, etc., are covered as well based on our LSPR and SERS technique.