What controls the composition and the structure of nanomaterials generated by laser ablation in liquid solution?

TLDR

Laser ablation synthesis in liquid solution (LASiS) is a green method that can produce a wide range of nanomaterials—from noble metal spheres to complex core‑shell and heterostructures—by tuning a few experimental parameters, yet the underlying chemical processes remain poorly understood. The study aims to address how to control the versatility of LASiS by elucidating the physical and chemical mechanisms governing nanomaterial synthesis. The authors summarize and temporally organize the fundamental mechanisms of laser ablation in liquids, correlating them with examples from the LASiS nanomaterial library to illustrate how synthesis parameters affect product composition and structure. The framework reveals that research has largely focused on laser‑matter interaction physics and product characterization, leaving the chemical processes during LASiS underexplored.

Abstract

Laser ablation synthesis in liquid solution (LASiS) is a "green" technique that gives access to the preparation of a library of nanomaterials. Bare noble metal spherical particles, multiphase core-shell oxides, metal-semiconductor heterostructures, layered organometallic compounds and other complex nanostructures can be obtained with the same experimental set up, just by varying a few synthetic parameters. How to govern such versatility is one of the current challenges of LASiS and requires a thorough understanding of the physical and chemical processes involved in the synthesis. In this perspective, the fundamental mechanisms of laser ablation in liquids are summarized, organized according to their temporal sequence and correlated with relevant examples taken from the library of nanomaterials disclosed by LASiS, in order to show how synthesis parameters influence the composition and the structure of products. The resulting framework suggests that, to date, much attention has been devoted to the physical aspects of laser-matter interaction and to the characterization of the final products of the synthesis. Conversely, the clarification of chemical processes active during LASiS deserves more research efforts and requires the synergy among multiple investigation techniques.