A luminescent steroid-based organogel: ON–OFF photoswitching by dopant interplay and templated synthesis of fluorescent nanoparticles
作者:Valeria C. Edelsztein、Elizabeth A. Jares-Erijman、Klaus Müllen、Pablo H. Di Chenna、Carla C. Spagnuolo
DOI:10.1039/c2jm34891h
日期:——
The modulation of the fluorescence emission of a perylene dye between ON and OFF states was achieved with high efficiency by means of a diarylethene photochromic compound in an organogel medium. Fluorescent gels were prepared from a steroidal low molecular weight organogelator doped with the perylene fluorophore. The compatibility of the photochromic compound in this medium and the non-destructive readout capability were demonstrated. The dye doped organogel was further used as a template and an innovative method was employed to grow fluorescent silica spherical nanoparticles with physically and chemically admixed perylene dye.
Preparation of n-type semiconducting polymer nanoarrays by covalent synthesis followed by crystallization
作者:Begum Fouzia、John Ferguson、Kelly McKenna、Louis E. McNamara、Nathan I. Hammer、Hemali Rathnayake
DOI:10.1039/c4nj00968a
日期:——
electrical characterization of thin films made from polymer nanoarrays shows typical semiconducting behaviour with the electrical conductivity of 0.48 × 10−3 S cm−1. The covalent synthesis followed by solution-based crystallization of PDIB-SSQ reported herein provides a new synthesis path to make ordered-crystalline semiconducting polymer nanoarrays and ultimately a benefit for better understanding of their
Process for making electronically active functionalized silsequioxane nanostructures of controlled morphology through covalent synthesis
申请人:Rathnayake Hemali
公开号:US09318716B1
公开(公告)日:2016-04-19
Disclosed is a composition comprising perylenediimide bridged dimethylethoxysilane. Disclosed also is an electronically active nanostructure comprising perylenediimide bridged dimethylethoxysilane. Disclosed also is a process for fabricating a photovoltaic device comprising depositing an electronically active nanostructure, the nanostructure made by hydrolysis and condensation of perylenediimide bridged dimethylethoxysilane, onto a substrate.
Silica encapsulated perylenediimide (PDI) nanoellipsoids with core-shell structure have been synthesized in solution by a combination of precipitation method and sol-gel chemistry. Electron energy loss spectrum (EELS) analysis proves that the obtained composite particles consist of a PDI core and a silica shell. The UV-vis and fluorescence spectra show the strong pi-pi stacking state of PDI molecules in the composite colloids. The silica deposition process on the PDI surface can be well controlled allowing variation of the shell thickness from 10 to 50 nm. Thermogravimetrical analysis data indicate that the thermal stability of PDI increases after deposition of a silica shell. The photostability of PDI is enhanced by the introduction of silica shell. The silica coating improves the dispersibility of PDI in different solvents and in polymer films.