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Related Concept Videos

The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors12:32

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Anodization parameters for growth of the aluminum-oxide dielectric layer of zinc-oxide thin-film transistors (TFTs) are varied to determine the effects on the electrical parameter responses. Analysis of variance (ANOVA) is applied to a Plackett-Burman design of experiments (DOE) to determine the manufacturing conditions that result in optimized device...
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Here, we present a protocol for the in situ synthesis of gold nanoparticles (AuNPs) within the interlayer space of layered titanate films without the aggregation of AuNPs. No spectral change was observed even after 4 months. The synthesized material has expected applications in catalysis, photo-catalysis, and the development of cost-effective plasmonic...
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Updated: Jan 20, 2026

The Effect of Anodization Parameters on the Aluminum Oxide Dielectric Layer of Thin-Film Transistors
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Combining Top-Down and Bottom-Up with Photodegradable Layer-by-Layer Films.

Matthew J Feeney1, Samuel W Thomas1

  • 1Department of Chemistry , Tufts University , 62 Talbot Avenue , Medford , Massachusetts 02155 , United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|September 6, 2019
PubMed
Summary

This study introduces photoreactive layer-by-layer (LbL) coatings for precise spatial control over interfacial properties. By combining bottom-up and top-down methods, these advanced polymer films offer enhanced functionality for diverse material applications.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Layer-by-layer (LbL) self-assembly is a versatile bottom-up technique for creating polymer coatings with tailored interfacial properties.
  • Traditional LbL coatings exhibit uniform chemical properties, limiting spatially resolved functional control.
  • Developing methods for spatiotemporal control over LbL film properties is crucial for advanced applications.

Purpose of the Study:

  • To develop photochemically reactive LbL coatings for precise spatiotemporal control over interfacial properties.
  • To investigate the use of charge-shifting polyelectrolytes with photocleavable ester pendants for LbL film modification.
  • To demonstrate the fabrication of patterned coatings and free-standing films using these photoreactive LbL systems.

Main Methods:

  • Utilized layer-by-layer (LbL) self-assembly with charge-shifting polyelectrolytes containing photocleavable ester groups.
  • Investigated the photolysis of ester pendants across various wavelengths (UV to near-infrared) to induce film degradation.
  • Developed techniques for spatially segregating reactive groups to create compartmentalized films and photopatterned structures.

Main Results:

  • Demonstrated that photolysis of photocleavable esters leads to the degradation of LbL films.
  • Showcased wavelength-dependent degradation, tunable by the chemical structure of photocleavable groups.
  • Successfully fabricated reactive free-standing polymer films and multiheight photopatterned coatings through spatial control.

Conclusions:

  • Photoreactive LbL films enable precise, spatially controlled modification of interfacial properties.
  • Combining bottom-up LbL assembly with top-down photochemical patterning offers a powerful approach for advanced materials.
  • This methodology opens new avenues for designing functional polymer and composite coatings with complex architectures.