L-α-dipalitoylphosphatidylcholine(DPPC) is a phospholipid, and a lung surfactant is used for dielectric surface patterning. In this technique, the self-assembling property of DPPC along with meniscus oscillation, which occurs in LangmuirBlodgett transfer, results in a spatially inhomogeneous distribution of two different phases of DPPC. This way, nanometre height rigid, tightly packed, and durable lateral structures separated by micron size channels are grown on the dielectric surface using the Langmuir-Blodgett deposition technique. The effect of surface modification and deposition parameters on the growth of the patterned surface is studied in detail. A simplified relationship between the surface energy of substrate and deposition parameters is explained in this work. Thus, deposition parameters can be tuned based on the modification of the surface gives more control over the growth of these structures. Lastly, the effect of post-annealing temperatures on the patterned surface is investigated. In conclusion, an easy, affordable, and less timeconsuming method of dielectric surface patterning using phospholipid is investigated, which has potential applications in improving the properties (such as charge mobility and contact resistance) of OFET, TFT and in bioelectronics.
Inhaltsverzeichnis (Table of Contents)
- Introduction
- Self-assembly
- DPPC
- Literature survey
- Stripe pattern formation using Langmuir-Blodgett deposition technique
- Effect of surface treatment on self-organized DPPC monolayer
- Selective deposition of organic molecules onto DPPC templates
- Effect of temperature on self-assembly of amphiphilic molecules
- Experimental techniques
- Langmuir-Blodgett deposition technique
- Sol-gel technique
- Spin-coating technique
- Atomic force microscopy(AFM)
- Optical Microscopy
- X-ray photoelectron spectroscope(XPS)
- X-ray reflectivity(XRR)
- Problem Statement
- Growth of Self-assembled monolayer (SAM) on Mica substrate
- Chemicals and equipment:
- Langmuir monolayer preparation:
- Monolayer transfer on substrate:
- Experimental Results
- Pressure Area Isotherm:
- AFM measurement:
- Discussion:
- Growth of Patterned SAM of DPPC on BTO surface
- Experimental section:
- Results:
- XPS measurements:
- XRR measurements:
- AFM and optical microscopy measurements:
- Discussion:
- Effect of post-annealing temperature on pattern SAM of DPPC on dielectric surface
- Experimental section:
- Results:
- Discussion:
- Conclusion
- References
Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)
This thesis investigates the growth of self-assembled patterned films on dielectric surfaces using the Langmuir-Blodgett deposition technique. The main objective is to explore the potential of utilizing dipalmitoylphosphatidylcholine (DPPC), a phospholipid, for dielectric surface patterning. The work focuses on understanding the self-assembly properties of DPPC and the effects of various parameters on pattern formation. The primary goal is to demonstrate a simple, cost-effective, and efficient method for dielectric surface patterning, potentially leading to improved properties in organic field-effect transistors (OFETs), thin-film transistors (TFTs), and bioelectronics.
- Self-assembly of DPPC on dielectric surfaces
- Influence of surface modification and deposition parameters on pattern formation
- Effect of post-annealing temperatures on patterned films
- Potential applications in OFETs, TFTs, and bioelectronics
- Development of a simplified model for understanding the relationship between surface energy and deposition parameters
Zusammenfassung der Kapitel (Chapter Summaries)
- The introduction section provides an overview of self-assembly, particularly focusing on the properties and applications of dipalmitoylphosphatidylcholine (DPPC). This section sets the stage for the subsequent exploration of DPPC-based surface patterning.
- The literature survey delves into existing research on stripe pattern formation using the Langmuir-Blodgett deposition technique, the impact of surface treatment on DPPC monolayers, the selective deposition of organic molecules onto DPPC templates, and the effect of temperature on the self-assembly of amphiphilic molecules. This review contextualizes the research presented in the thesis and highlights key findings from previous studies.
- Chapter 3 outlines the experimental techniques employed in the thesis. This section explains the Langmuir-Blodgett deposition technique, sol-gel technique, spin-coating technique, atomic force microscopy (AFM), optical microscopy, X-ray photoelectron spectroscopy (XPS), and X-ray reflectivity (XRR). This comprehensive description allows for the understanding and interpretation of the results presented in subsequent chapters.
- Chapter 4 presents the problem statement, which focuses on the growth of self-assembled monolayers (SAMs) on mica substrates. This chapter introduces the specific challenges and objectives of the research.
- Chapter 5 details the experimental procedures and results for the growth of SAMs on mica substrates. It includes a discussion on pressure area isotherms and AFM measurements. This chapter provides insights into the formation and characterization of DPPC monolayers on a specific substrate.
- Chapter 6 investigates the growth of patterned SAMs of DPPC on barium titanate (BTO) surfaces. This chapter presents experimental results from XPS, XRR, AFM, and optical microscopy measurements, providing a comprehensive analysis of the patterned structures formed on BTO.
- Chapter 7 examines the effects of post-annealing temperatures on the patterned SAMs of DPPC on dielectric surfaces. This chapter explores the impact of heat treatment on the stability and properties of the patterned films.
Schlüsselwörter (Keywords)
This thesis focuses on the growth of self-assembled patterned films on dielectric surfaces using the Langmuir-Blodgett deposition technique. The key concepts include dipalmitoylphosphatidylcholine (DPPC), self-assembly, surface patterning, Langmuir-Blodgett deposition, surface modification, deposition parameters, post-annealing temperature, organic field-effect transistors (OFETs), thin-film transistors (TFTs), and bioelectronics.
- Quote paper
- Satyabrat Behera (Author), 2020, Growth of Self-Assembled Patterned Films on Dielectric Surfaces Using Langmuir-Blodgett Deposition Technique, Munich, GRIN Verlag, https://www.grin.com/document/1445647
