Polymeric Micelle Assembly for the Direct Synthesis of Platinum-Decorated Mesoporous TiO₂ toward Highly Selective Sensing of Acetaldehyde

Abstract

Platinum-decorated mesoporous TiO2 is synthesized by the self-assembly of polymeric micelles of an asymmetric triblock copolymer with three chemically distinct units in an acidic tetrahydrofuran solution. The strong hydrophobic interaction of platinum(II) 2,4-pentanedionate with a polystyrene core and electrostatic interaction of titanium tetraisopropoxide with a poly(vinylpyridine) shell enable us to directly synthesize crystalline mesoporous TiO2 with platinum nanoparticles. A thermally stable block copolymer prevents collapse of the ordered mesostructure during the calcination process. The platinum source is in situ reduced to form the platinum nanoparticles on the TiO2 walls. The sensing performance of platinum-decorated mesoporous TiO2 is studied in detail using a quartz crystal microbalance technique, and it is found that it shows excellent sensitivity for acetaldehyde.

Synthesis of a Large‐Sized Mesoporous Phosphosilicate Thin Film through Evaporation‐Induced Polymeric Micelle Assembly

“…The beauty of this approach is that the pore size and wall thickness can be easily tuned by changing the molecular weight of the block copolymer and precursor/polymer ratio, respectively 20–22. Sol‐gel precursors of phosphosilicate comprise different molar ratios of inorganic precursors (H 3 PO 4 and TEOS).…”

“…The mesoporous phosphosilicate films were synthesized through our previous micelle assembly approach 20–22. PS‐ b ‐P2VP‐ b ‐PEO block copolymer (20 mg) was dissolved in THF (4 mL).…”

Mesoporous TiO2Thin Film Formed From a Bioinspired Supramolecular Assembly

“…The calcination process removed the PVBT template and transformed the amorphous TiO 2 framework into a highly crystalline anatase TiO 2 framework. We tested several different calcination temperatures to investigate their effects on the crystallinity and morphology of the final TiO 2 mesoporous structures . In general, low‐molecular‐weight block copolymers (e. g., Pluronic P‐123) burnt out at around 250 ° C which is much lower than the crystallization temperature of TiO 2 (ca.…”

Highly Efficient Elimination of Carbon Monoxide with Binary Copper-Manganese Oxide Contained Ordered Nanoporous Silicas

“…Recently, the related materials have been reported by different groups. It would be better to cite some examples [6–8]. Even though these supported noble metal-based catalysts have shown high activities for carbon monoxide elimination, their further application has been limited due to difficulties in reuse, sintering at high temperature, and high cost [9–12].…”