Enhanced Optical Nonlinearity in Noncovalently Functionalized Amphiphilic Graphene Composites

Abstract

The good solubility of graphene‐based materials in various solvents without sacrificing their intrinsic properties is a prerequisite for their further applications. In particular, it is important for application as a practical optical limiter. A comprehensive study was conducted on the nonlinear optical property of a rationally designed amphiphilic graphene composite (PEG‐OPE‐rGO). By taking advantages of the unique energy diagram of this graphene composite, the optical limiting (OL) performances of PEG‐OPE‐rGO, which is either dissolved in solvents with moderate polarity or fabricated into thin solid films, are beyond the reported results for other graphene composites. Importantly, the main factors for the enhanced OL response of PEG‐OPE‐rGO are the multiphoton absorption and Förster resonance energy transfer process, instead of the nonlinear scattering mechanism observed for common nanostructured materials. The excellent OL response of PEG‐OPE‐rGO allows it to be one of the best candidates in practical optical limiters. Moreover, the mechanism analysis provides the deep insight for further optimization of the design of promising OL materials.

Donor-Acceptor Type Reduced Graphene-Oxide and a Tin-Selenide Nanohybrid With Broad and Ultrafast Optical Limiting Properties

“…When the excitation wavelength changes to near infrared (800 nm), the SnSe nanosheets exhibit a significant RSA response, which is similar to previous reports by Ye et al [37]. Interestingly, for RGO, there is an RSA response with the excitation wavelength at 400 and 600 nm, which is consistent with previous studies [30]. The NLO absorption response exhibits an SA response, when the excitation wavelength is 800 nm.…”

“…In contrast, RGO is a semiconductor with a tunable bandgap (0.5-6 eV) [29]. The non-linear absorption coefficient of RGO was determined as 2.67 cm/GW at a wavelength of 532 nm [30]. This suggests a considerable RSA response in the visible region.…”

Efficient Energy Transfer under Two‐Photon Excitation in a 3D, Supramolecular, Zn(II)‐Coordinated, Self‐Assembled Organic Network

“…Moreover, only acceptor emission appeared in the extended 3D MLC under the excitation of 325–570 nm (Figure S4, Supporting Information), directly indicating the broadband energy transfer in the extended 3D MLC. The energy transfer process can be realized by either FRET or reabsorption, which can be distinguished by measuring the excitation spectra and time‐resolved photoluminescence (TRPL) spectra . As a result of energy transfer, the contribution of donor to acceptor emission can be estimated by comparing the excitation spectra of acceptors alone and in extended 3D MLC .…”

Organic Liquids-Responsive β-Cyclodextrin-Functionalized Graphene-Based Fluorescence Probe: Label-Free Selective Detection of Tetrahydrofuran

“…Graphene, a monolayer of carbon atoms patterned into a hexagonal π-conjugated honeycomb structure, has attracted a great deal of attention across various scientific disciplines. This is owing to its unique physical and chemical properties [1], such as its giant specific surface area [2], ultra-high electrical conductivity [3], thermal conductivity [4] and mechanical strength [5], superior thermal and chemical stabilities [6,7], and remarkable fluorescence quenching property [8,9], among others [10]. Great efforts have thus been dedicated to the applications of graphene using these properties, among which optical fluorescence-based detection applications have recently received intense interest based on graphene oxide (GO) and graphene platforms because of the easy fabrication, functionalization and sensitization of the platforms [11].…”