Covalently Silane-Functionalized Antimonene Nanosheets and Their Copolymerized Gel Glasses for Broadband Vis–NIR Optical Limiting

et al. 2021

ACS Appl. Nano Mater.

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Two-dimensional materials are among the most efficient optical materials for Q-switched pulse applications, rising to unprecedented heights. Although the exploration of 2D nanomaterials has attracted strong interest, the results from current studies remain questionable, requiring further achievements in tailored control of their properties. In this work, antimony sulfide (Sb2S3) nanosheets are prepared by liquid-phase exfoliation, and nanosheets of different sizes are obtained by regulating ultrasonication parameters and centrifugation speed. The nonlinear optical properties of Sb2S3 nanosheets are investigated using the Z-scan technique for the first time, which exhibit excellent saturable absorption and thereby promising potential for saturable absorber applications. Among the different sizes of Sb2S3 nanosheets, the smaller-sized nanosheets exhibit better nonlinear optical properties, which is ascribed to the higher proportion of surfaces and edges. Finally, stable laser pulses with peak power as high as 2.68 W are readily generated at the wavelength of 1064 nm. This work opens an innovative avenue toward nonlinear optical devices based on Sb2S3 and provides reasonable regulation of 2D saturable absorbers.

Section: Introductionmentioning

confidence: 99%

Antimony Sulfide Nanosheets with Size-Dependent Nonlinear Optical Properties for Q-Switched Pulse Applications

Zhao

et al. 2021

ACS Appl. Nano Mater.

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“…Recently, silane functionalization by our groups has shown tremendous development prospects for optical materials and devices in other nanomaterial fields such as hexagonal boron nitride nanosheets, graphene, antimonene, gold nanoparticles, and others. [75][76][77][78] The strategy find a new type of functional materials. More importantly, a novel method of fabricating hybrid materials was put forward, which can further broadening application areas and promote the intersection between various functional nanomaterials.…”

Section: Discussionmentioning

confidence: 99%

Silane‐Functionalized Carbon Dots and Their Polymerized Hybrids: From Optoelectronics to Biotherapy

Dong

Guan

et al. 2021

Small

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matrices can show their unique intrinsic features. [5][6][7] Many hybrid composites and devices with excellent performance often require high doping concentration of functional materials. However, high doping ratio tends to result in adverse effects such as dropped transmittance caused by Rayleigh scattering, [8] weakened optoelectronic and mechanical performance. [9,10] Therefore, maintaining the intrinsic properties of nanoparticles while improving the doping concentration of nanomaterials becomes an urgent subject. There are two approaches to limit nanomaterials in substrates: physical dispersion and chemical dispersion. Physical dispersion of guest materials in host matrices is a conventional approach to prepare hybrid composites. Due to the weak physical interaction, the performance usually is impaired. Compared with physical dispersion, the covalent bond can prevent the phase separation existing in hybrid materials. [11] Among these ways, sol-gel method is a helpful technique to modify nanomaterials and prepare nano-or macroscale organic-inorganic hybrid materials such as glasses, ceramics, films, coatings, fibers, and powders. [12] Silane coupling agents or organosilicon polymers (silicone oil, resin, rubber, etc.) are introduced in the route based on the advantages of simultaneously possessing hydrophilic and lipophilic groups. First, they can elevate the dispersibility of nanomaterials in solutions. Second, they successfully link organic and inorganic phases with covalent bonds. Third, the introduction of silicon promotes the radiation recombination of electron/hole pairs through providing different surface states. There are five empty d orbitals of a silicon atom, where can be occupied by electrons of connected atoms or functional groups to form a dπ-pπ bond. [13] Owing to the above features, the hybrid materials inherit the superiorities of organosilanes: excellent resistance against high temperature; [14] stability under UV radiation; [15] lower surface tension, lower surface energy, and more prominent film-forming ability. [13] Since the discovery in 2004, carbon dots (CDs) have become promising issues due to their outstanding optical properties, such as high quantum yield (QY), photobleaching resistance, upconversion photoluminescence (PL). [16][17][18][19][20] In previous works, a concept of one-step prefunctionalization was brought up, using citric acid and long-chain amino-silanes as starting materials to prepare silane-functionalized CDs (SiCDs). [18] These types of CDs represent either "silane-functionalized carbon dots" or Nanomaterials usually manifest unique properties in solutions but will be undermined in the solid state. It is necessary to incorporate them into substrates or hybrid them with other functional materials for multiple devices and applications. Though there are a variety of methods to inherit their intrinsic properties like fluorescent and mechanical performance, most nanohybrid materials would lose their transparency irreversibly when construct solid-state devices. As a hot t...

“…On the other hand, NLO properties can be well studied in solution, but it is essential to incorporate NLO materials into a solid-state matrix for further practical application. 1,49 One attractive approach is the sol-gel glasses technique, especially, organically modified silica (ORMOSIL) gel glasses. 50 It is an ideal matrix for a solid device due to its advantages including a high threshold of laser damage, good transparency in the UV-LW NIR region, and excellent optical, thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Polyoxometalates with tunable third-order nonlinear optical and superbroadband optical limiting properties

et al. 2022

Inorg. Chem. Front.

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