In situfabricated platinum—poly(vinyl alcohol) nanocomposite thin film: a highly reusable ‘dip catalyst’ for hydrogenation

‘Dip Catalysts’ Based on Polymer‐Metal Nanocomposite Thin Films: Combining Soft‐Chemical Fabrication with Efficient Application and Monitoring

“…Pt‐PVA thin film was fabricated by the in situ protocol using H 2 PtCl 6 as well as K 2 PtCl 4 as the metal precursor; the films obtained are <100 nm thick and contain 1–2 nm size nanoparticles. The nanocomposite film was used as a dip catalyst for the reduction of methylene blue by sodium borohydride in aqueous medium, with high efficiency and extensive reusability; TON and TOF obtained based on 10 cycles of usage were 550 and 5.5 min −1 respectively, superior to similar catalysts reported earlier (Table ). High reproducibility was observed in the kinetics of the reaction over multiple cycles.…”

“…An interesting observation was that the nanoplates were largely oriented parallel to the substrate plane. The in situ protocol has been utilized to fabricate palladium nanowires (Figure c), as well as ultra‐small platinum nanoparticles embedded in PVA thin films;, the former provided a graphic illustration of a crystal‐to‐crystal transformation at the nanoscale. Unique materials like Hg nanodrops could be generated in situ in PVA thin films using the same protocol; the nanodrops could be frozen into nanocrystals in a cryo‐TEM and characterized by electron diffraction .…”

Fluorescence microscopy and photodielectric characterization studies of the composite films of polyvinyl alcohol and tryptophan functionalized silver nanoparticles

“…PVA has good chelation properties and may act as both a reducing agent and a stabilizer for metallic nanoparticles [4]. For these reasons, it has been extensively used as a matrix for nanoparticles of noble metals such as Au [5][6][7], Ag [7][8][9][10][11][12][13][14][15][16], Cu [8], Pt [17]. PVA-noble metal nanocomposites are especially interesting for optical applications [5][6][7][8][9][10][11], but they have been also employed for sensing [12], as thin film capacitors [13] and for catalysis [17].…”

“…For these reasons, it has been extensively used as a matrix for nanoparticles of noble metals such as Au [5][6][7], Ag [7][8][9][10][11][12][13][14][15][16], Cu [8], Pt [17]. PVA-noble metal nanocomposites are especially interesting for optical applications [5][6][7][8][9][10][11], but they have been also employed for sensing [12], as thin film capacitors [13] and for catalysis [17]. In addition, PVA-Ag nanocomposites exhibit antimicrobial properties due to the potent activity of silver nanoparticles against gram-negative and gram-positive bacteria [11,15,16].…”

Spray-Assisted Interfacial Polymerization to Form CuII/I@CMC-PANI Film: An Efficient Dip Catalyst for A3 Reaction

“…A considerable number of dip catalysts have been well documented in the last dozen years, and the range of reported dip catalysts includes Pt@GS (dip coating) [ 3 ], CMC-Ni-BC (coating) [ 4 ], gold nanoparticle-loaded filter paper (impregnated into the filter paper) [ 5 ], palladium nanoparticle-loaded cellulose paper (dip coating) [ 6 ], Pd@filter paper (dip coating) [ 7 ], Pt-PVA thin film (spin coating) [ 8 ], Pd-PVA (spin coating) [ 9 ], AgNPs@NH 2 -CP (chemical modification) [ 10 ], Cu@CS-FP (layer coating) [ 11 ], Ag/CH-FP (layer coating) [ 12 ], and so on. Common strategies for the fabrication of a dip catalyst previously included dip-coating [ 3 , 4 , 5 , 6 , 7 ] and spin-coating technology [ 8 , 9 ], chemical modification of thin films with a variety of functional units [ 10 ], and layer coating over thin films with functional material [ 11 , 12 ]. However, these preparation procedures suffered from one or more drawbacks, such as tedious operation, being time consuming, involving multiple step reactions, and possessing low catalytic performance.…”