Au‐NP‐Decorated Crystalline FeOCl Nanosheet: Facile Synthesis by Laser Ablation in Liquid and its Exclusive Gas Sensing Response to HCl at Room Temperature

Abstract

reported as a new effi cient Fenton-like catalyst for yielding oxidative hydroxyl radicals (HO•) to degrade organic contaminants. [ 5 ] Other applications are rarely reported in the literature. In any case, it is commonly accepted that the performances are closely related with morphology, structure, specifi c area, and chemical stability of FeOCl nanomaterials, which strongly depends on the preparation strategies and experimental conditions. [ 6 ] For decades, however, almost all the reported FeOCl materials were obtained by one exclusive strategy, the chemical vapor transport (CVT), which utilizes FeCl 3 and Fe 2 O 3 mixed powders as precursor and requires a heating procedure at a temperature of 380 °C over days. [ 5,7 ] The CVT strategy is extremely time consuming and asobtained FeOCl materials possess single morphology of nanoplate with micrometer dimensions. Also, the fi nite experimental parameters make it diffi cult to effectively modulate the microstructure, morphology and composition, which limits its practical applications in fi elds of catalysis, energy storage, and conducting materials. Recently, we developed a new technique, laser ablation in liquid solution (LAL), to facilely synthesize the crystalline FeOCl nanosheets at ambient conditions. By laser ablating Au foil in surrounding FeCl 3 solutions for minutes, spherical Au nanoparticles (NPs) decorated FeOCl nanosheets could be synthesized in a one-pot procedure. Technical characterizations illustrate that the crystalline nanosheets possess (010) preferred orientations with microsized dimensions in the plane and tens of nanometers in thickness. The Au/FeOCl nanocomposites own good thermal stability and surface of which adsorbs abundant H 2 O molecularly and oxygen species chemically. The fabrication route is simple and much more effi cient compared to the traditional CVT method. Furthermore, the crystalline size and proportion of Au or FeOCl in the nanocomposites could be effectively modulated by simply changing FeCl 3 concentrations. We proposed that the localized liquid region, formed around the interface between LAL-induced plasma plume and surrounding liquid, provides the hydrolysis reaction platform for the formation of FeOCl nanosheets.

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

“…While the particles are formed from the superheated metal plume at the plume‐water interface and ripen further inside the cavitation bubble, a redox reaction is most likely initiated between nanoparticle seeds and metal ions during laser ablation resulting in the formation of alloy NPs. This intended redox reaction harvesting dissolved precursor‐salt ions as nanoparticle constituents are categorized as Reactive Laser Ablation in Liquids (RLAL) …”

One‐Step and Surfactant‐Free Fabrication of Gold‐Nanoparticle‐Decorated Bismuth Oxychloride Nanosheets Based on Laser Ablation in Solution and Their Enhanced Visible‐Light Plasmonic Photocatalysis

“…produced by laser ablation in our previousw ork, the morphology of whichw as not dependento nt he concentration of precursor solutions (FeCl 3 )e xcept in terms of the relative amount and size of the components, [29] the morphologyo ft he BiOCl evolved, with the decrease of the Cl/Bi molar ratio from 1t o 10 À3 ,f rom flat nanosheets ( Figure 2) to the unformed curly and thinner nanosheets (Figure 5a and b), and finally the mixture of curly nanosheets and spherical particles ( Figure 5c); in addition, the yield of BiOCl was ever-decreasing. produced by laser ablation in our previousw ork, the morphology of whichw as not dependento nt he concentration of precursor solutions (FeCl 3 )e xcept in terms of the relative amount and size of the components, [29] the morphologyo ft he BiOCl evolved, with the decrease of the Cl/Bi molar ratio from 1t o 10 À3 ,f rom flat nanosheets ( Figure 2) to the unformed curly and thinner nanosheets (Figure 5a and b), and finally the mixture of curly nanosheets and spherical particles ( Figure 5c); in addition, the yield of BiOCl was ever-decreasing.…”

“…[29] In the presentw ork, we fabricated the Au-NP-decorated BiOCl nanosheets based on laser ablation of gold in aB i(NO 3 ) 3 aqueous solution with addition of HCl as the Cl source,w hich revealed the influence of the Cl/Bi molar ratio and the concentration of H + in solutiono nt he formationo f the BiOCl nanosheets. These nanosheets are sub-micron in the planard imensiona nd around 20 nm in thickness, and decorated with Au NPs of am ean size of approximately 20 nm.…”

“…[29] Formation of such nanosheets should be independent of the target species, and metalso ther than Au coulda lso be used as targets. [29] Formation of such nanosheets should be independent of the target species, and metalso ther than Au coulda lso be used as targets.…”

“…[26][27][28] Recently,w eh ave demonstrated fabrication of FeOCl nanosheets with Au NPs attached by laser ablation of ag old target in as olution of FeCl 3 , [29] which provides an ew perspective for the preparation of BiOCl-based plasmonic photocatalysts. [26][27][28] Recently,w eh ave demonstrated fabrication of FeOCl nanosheets with Au NPs attached by laser ablation of ag old target in as olution of FeCl 3 , [29] which provides an ew perspective for the preparation of BiOCl-based plasmonic photocatalysts.…”