Stable multilayer ultrathin film containing covalently attached colloidal Ag nanoparticles

Abstract

Stable multilayer ultrathin films were constructed by alternate deposition of nitro-diazoresin (NDR) and Ag nanoparticles (Ag-NPs) followed by UV irradiation. The absorbance of the un-irradiated film at 385 and 412 nm, which is the characteristic absorption of –N2+ of NDR and Ag-NPs respectively, increases linearly with the fabrication cycle. This result shows that the layer-by-layer electrostatic deposition of NDR and Ag-NPs is successful and uniform. An atomic force microscopy image of the film with four deposition cycles demonstrates the presence of the close-packed Ag-NPs with the average roughness of 1.5 nm. Furthermore, the stability of the irradiated film toward polar solvents and salty liquids increases significantly, due to the formation of covalent bonds between the layers of the assembled film upon exposure to UV light.

Controlling Structure from the Bottom-Up: Structural and Optical Properties of Layer-by-Layer Assembled Palladium Coordination-Based Multilayers

“…[23][24][25] Colloid-or nanoparticles-based multilayer assemblies are also uncommon. [56][57][58][59][60] Device-quality organic assemblies have been integrated into prototype frequency-doubling devices, electrooptical modulators, and light-emitting diodes (OLEDs). 1,14,15,[61][62][63][64] Multilayer assemblies are often difficult to pattern, 17,65 which is a necessary requirement for device formation.…”

Covalent Layer‐by‐Layer Assembly and Solvent Memory of Multilayer Films from Homobifunctional Poly(dimethylsiloxane)

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Layer-by-layer (LbL) assembled films have attracted attention as multicomposite conformal coatings either for the purpose of functionalizing surfaces with a large variety of different components or for the fabrication of electrical or optical thin-film devices. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Poly(dimethylsiloxane) (PDMS; Scheme 1), the most commonly used silicone-based organic polymer, is an elastomer whose unique molecular structure and physicochemical properties make it suitable for a broad range of applications, including lubricants, sealants, adhesives, eye contact lenses, microfluidic devices, or stamps for microcontact printing. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Poly(dimethylsiloxane) (PDMS; Scheme 1), the most commonly used silicone-based organic polymer, is an elastomer whose unique molecular structure and physicochemical properties make it suitable for a broad range of applications, including lubricants, sealants, adhesives, eye contact lenses, microfluidic devices, or stamps for microcontact printing.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] While most work on LbL films is based on electrostatic interactions, the use of covalent bonds has been reported as well. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Poly(dimethylsiloxane) (PDMS; Scheme 1), the most commonly used silicone-based organic polymer, is an elastomer whose unique molecular structure and physicochemical properties make it suitable for a broad range of applications, including lubricants, sealants, adhesives, eye contact lenses, microfluidic devices, or stamps for microcontact printing. [33] Although polyelectrolyte multilayers have been assembled on PDMS objects in various geometries, [34][35][36][37][38][39][40][41][42][43][44][45] there have not yet been any reports on the fabrication of multilayer films containing end-functionalized PDMS as a cons...…”

The formation and characterisation of ultra-thin films containing Ag nanoparticles

“…It has been exploited in the formation of both SERS substrates 4,[17][18][19] and antibacterial surfaces 20,21 where metal nanoparticles have been incorporated into these films. This has been achieved by using pre-prepared nanoparticle sols 4,5,[22][23][24] or reducing metal ions inside LbL films either with NaBH 4 solution 1,25 or heating in H 2 atmosphere. 26 However, to the best of the authors' knowledge, antibacterial surfaces comprise layers in which nanoparticles are weakly associated giving rise to the strong possibility of nanoparticle diffusion into the surrounding environment.…”