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One-pot synthesis of sub-10 nm LiNbO nanocrystals exhibiting a tunable optical second harmonic response. | LitMetric

Nanophotonics, dealing with the properties of light interacting with nanometer scale materials and structures, has emerged as a sought after platform for sensing and imaging applications, and is impacting fields that include advanced information technology, signal processing circuits, and cryptography. Lithium niobate (LiNbO) is a unique photonic material, often referred to as the "silicon of photonics" due to its excellent optical properties. In this article, we introduce a solution-phase method to prepare single-crystalline LiNbO nanoparticles with average diameters of 7 nm. This one-pot approach forms well-dispersed LiNbO nanocrystals without additional organic additives (, surfactants) to control growth and aggregation of the nanoparticles. Formation of these LiNbO nanocrystals proceeds through a non-aqueous sol-gel reaction, in which lithium hydroxide and niobium hydroxide species were generated . The reaction proceeded through both a condensation and crystallization of these reactants to form the solid nanoparticles. These nanocrystals of LiNbO were active for optical second harmonic generation (SHG) with a tunable response from 400 to 500 nm. These nanoparticles could enable further development of non-linear optical techniques such as SHG microscopy for bioimaging, which requires the dimensions of nanoparticles to be well below 100 nm.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9417713PMC
http://dx.doi.org/10.1039/c8na00171eDOI Listing

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