In this talk, I will discuss a set of designer polymer-ligated nanocrystals (NCs) with precisely controlled dimensions, compositions and surface chemistry. These NCs include<br/>0D nanoparticles (NPs) and 1D nanorods (NRs), and possess intriguing reversible, stimuli-responsive optical and catalytic properties. The size and shape of these polymer-ligated NPs and NRs can be conveniently tailored by implementing star-like and bottlebrush-like amphiphilic block copolymers, respectively, as nanoreactors. The permanent anchoring of stimuli-responsive polymers on the NC surface renders their self-assembly and disassembly on demand using stimuli of different wavelengths or temperature. Specifically, photo-responsive polymer-ligated noble metal NCs (both NPs and NRs) display tunable surface-plasmon resonance absorption and the reversible transformation of NCs between their dispersed and aggregated states, where in particular long-range, liquid crystal-like assemblies are yielded from the self-assembly of photo-responsive polymer-ligated NRs. Moreover, thermo-responsive polymer-ligated noble metal NCs manifest controllable catalytic activity in nonmonotontic or on/off manner over a broad region of temperature. Photo-responsive polymer-ligated all-inorganic perovskite NCs will also be discussed. These stimuli-responsive polymer-ligated NCs and their assemblies are multifunctional. They may render fundamental research in self-assembly and crystallization kinetics of NCs as well as potential applications in optics, optoelectronics, magnetic technologies, sensory materials and devices, catalysis, nanotechnology, and biotechnology.

Polymer-ligated nanocrystals with designer dimensions, compositions, stimuli responsivities and optical properties

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