Engineered Silica Surfaces with an Assembled C₆₀ Fullerene Monolayer

Abstract

A covalently assembled monolayer of 61-(p-hydroxyphenylmethano)fullerene [C60] molecules has been synthesized. Both static and dynamic contact angle measurements show that the hydrophobic character increases upon the fullerene linkage. Atomic force microscopy lithography shows that the depth of the monolayer is about 19 Å. UV−vis spectra are well-tuned with the presence of the fullerene on the silica surfaces. The surface atomic composition, investigated by angle-resolved X-ray photoelectron spectra, shows a monotonic increase of the carbon signal upon decreasing the photoelectron takeoff angles, thus confirming the upper layer nature of this signal. Room-temperature photoluminescence spectra, under controlled atmosphere, show that the oxygen presence influences considerably the luminescence quantum yield.

Conjugated Gold–Porphyrin Monolayers Assembled on Inorganic Surfaces

“…Sincet he band at 402.4 eV is due to quaternized nitrogen (N + ), [72][73][74][75] this fact implies that the porphyrin grafts to the surface using two pyridine groups. [43,67] After the formation of an AuNPs monolayer chemisorbed on the porphyrin monolayer,n amely Au@PH 2 TPP_SAM, the system was newly characterized by visible, XPS and luminescence spectra.F igure 1( blue line) shows the absorption spectrum characterizedb yt he plasmon resonance of the Au@PH 2 TPP_SAM at 529.6 nm, 16.4 nm shifted with respectt o the solutionv alue. Figure 4s hows the emission properties of the PH 2 TPP_SAM.…”

Ratiometric Dissolved Oxygen Sensors Based on Ruthenium Complex Doped with Silver Nanoparticles

“…Several dyes have been used for luminescence-based oxygen sensors, such as polycyclic aromatic hydrocarbons [2], quinoline, pyrenebutyricacid [3], transition metal–ligand complexes of palladium and iridium [4,5], osmium [6], rhenium [7,8], ruthenium [9,10,11,12,13,14,15], platinum [16,17], metalloporphyrins, and polypyridine complexes [18]. The luminescence 61-(p-hydroxyphenyl methano) fullerene has also been reported for oxygen sensing by covalently immobilization [19]. In applications for sensing dissolved oxygen, metal ruthenium complexes and metal porphyrin complexes are the most widely used oxygen dyes [13], because ruthenium complexes have broad absorption bands located most often in the blue region (400–480 nm) of the visible spectrum, and they also possess the advantages of moderate brightness, long phosphorescent lifetime, excellent photostability, nontoxicity, and a long Stokes-shift.…”

Tuning oxygen sensitivity of ruthenium complex exploiting silver nanoparticles

“…These organic dyes are pyrene and its derivatives [2], pyrenebutyricacid, quinoline and phenanthrene [3], transition metal complexes of osmium [4], rhenium [5,6], platinum [7,8], palladium and iridium [9,10], ruthenium [11][12][13][14][15][16][17], polypyridine complexes and metalloporphyrins [18]. Covalently assembled monolayer of 61-(p-hydroxyphenylmethano) fullerene molecules has also been used for oxygen sensing [19]. Among these dyes, the ruthenium(II) polypyridine complexes have been the most intensively utilized dye.…”