Self‐Assembly of Biocompatible FeSe Hollow Nanostructures and 2D CuFeSe Nanosheets with One‐ and Two‐Photon Luminescence Properties

Abstract

Se-based semiconductors are produced in organisms with hydrophobic alkyl-chains, it appears highly monodispersity and uniformity, distinguished optical properties, and long-time stability features in different characterizations. [5,6] Up to present, there exhibits following photoluminescence of semiconductors: (1) fabricated different dimensional construction such as Ag 2 Se quantum dots, CdTe nanowires (NWs), nanosheets (NSs), and heterogeneous Au@CdTe core-shell structure [7,8] ; (2) the alloyed structure such as CdSeS, CdZnSe, ZnSSe, CdHgTe, CdPbS, CdZnS, CdInSe, AgInSe, AgInS, and so on. The heavy metal elements restrict its further applications in biological, especially makes controversial in imaging applications, and biomedical diagnosis [9][10][11] ; (3) environmentally friendly QDs and derivatives materials, Such as InP,ZnS,Ag 2 S, Ag 2 Se,CdS, ZnSe, CdSe, and GaSe and so on. [12][13][14] In order to establish proper approaches to overcome the heavy metal toxicity, hydrophobic attachment, and simplex dimension during investigating the possible candidates, resultant should be acceptable in maintaining relatively optical properties, and understandable in fabricating procedures. [15][16][17][18][19][20][21] One factor is that heavy or precious metal elements are not utilized in convenient synthetic works for environmental and inexpensive Transition metal chalcogenides are investigated for catalyst, intermediary agency, and particular optical properties because of their distinguished electron-vacancy-transfer (EVT) process toward different applications. In this work, one convenient approach for making pure-phased FeSe nanocrystals (NCs) and doped CuFeSe nanosheets (NSs) through a wet chemistry method in mixed solvents is illustrated. The surface modification of each product is realized by using a peptide molecule glutathione (GSH), in which the thiol group (−SH) is ascribed to be the in situ reducer and bonding agency between the crystalline surface and surfactant in whole constructing processes. Due to the functional groups in biological GSH, highly aggregated NCs are rebuilt in the form of an FeSe hollow structure through amino and carboxyl cross-linking functions through a spontaneous assembly procedure. Owing to the coupling procedure of Cu and Fe in the growth process, it generates enhanced EVT. Additionally, it shows the emission spectra of λ EM-PL = 436 nm (FeSe) and 452 nm (CuFeSe) while λ EX-PL = 356 nm, it also conveys two-photon phenomenon while λ EX-PL = 720 nm. Moreover, it also shows strong off-resonant luminescence due to two-photon absorption, which should be valuable for biological applications.

Metal Cluster Triggered-Assembling Heterogeneous Au-Ag Nanoclusters with Highly Loading Performance and Biocompatible Capability

“…Heterogeneous Au-Ag NCs were fabricated during in-assembly approaches via a simple approach, as shown in Figure 1 a; the scheme could reflect the main bond-forming process in a chemical environment ( Figure 1 c). A similar phenomenon was already conveyed exactly in our previous works [ 56 ]. In the processes of assembled heterogeneous Au-Ag NCs, the individual Au or Ag cluster were modified by GSH molecule completely, which played a key role in chemical and physical stabilities.…”

Visible-Light Photocatalytic CO2 Reduction Using Metal-Organic Framework Derived Ni(OH)2 Nanocages: A Synergy from Multiple Light Reflection, Static Charge Transfer, and Oxygen Vacancies

“…When used for photocatalysts, hollowed nanostructures are particularly attractive because of their multiple light reflection and scattering behavior for reinforcing light absorbance, − as well as functioning as nanoreactors with highly exposed active sites for efficient redox charge transfer. − Thus far, numerous strategies have been employed to synthesize such hollowed nanostructures for photocatalysis, including Oswald ripening, , hard/soft template-assisted ensembling, − self-assembly, − chemical etching, , and Kirkendall diffusion. − Nonetheless, it is still challenging to realize a controllable structure and composition tailored for photocatalytic processes in a facile manner. Moreover, previous studies involving hollowed structures for photocatalysis have mainly limited to photoresponsive inorganic materials on which noble metal-based cocatalysts such as Pt and Au nanoparticles are typically deposited to ensure the efficient use of photogenerated carriers. − In the opposite manner, hollowed cocatalysts with potent active sites combined with highly efficient molecular photosensitizers have been rarely obtained.…”

Iron–Molybdenum Quantum Dots for Enhancing the Nitrogenase Activity of Nodules

“…GSH has been well utilized in the synthesis process, and its molecular functional groups such as −COOH (carboxyl) and −NH 2 (amino) allow for the possibility of spontaneous self-assembly behavior. Its impact during polymerization can be attributed to electrostatic interactions and hydrogen bond formation . Hydrogen bonding may lead to the aggregation of nanoparticles to form larger nanospheres.…”