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The Use of Color Indicators for Plasma Enhanced Chemical Vapor
Deposition (PECVD) Films
Brian LopasPhysics Teacher
Navasota High School, Navasota ISDDavid Staack, Ph.D.
Assistant Professor Department of Mechanical Engineering
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Tsung-Chan “Cliff” TsaiDr. David Staack
Plasma Engineering and Diagnostics Laboratory
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4th state of matter: ionized gas
Made of freely moving electrons and ions
Electrically charged particles that respond to electric and magnetic fields
Most abundant in the cosmos
What is plasma?
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High temp electrons (20000 °F)Cold neutral gas – safe to touch
Examples:
Natural: Aurora borealis Artificial: Fluorescent lamp
Non-Thermal “Cold” Plasma
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Non-Thermal “Cold” Plasma
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Plasma Enhanced Chemical Vapor Deposition (PECVD)
Characteristics:• Non-thermal plasma• Adhesive to varies surfaces• Sterilizer
MMA
Floating substrate
HV
Power Supply
Helium
+-
--
-- -
- - -- -
- --
++
+ + ++ +
+++- - -
-
-
Electrode
Dielectric tube Plasma jet
* **
* *
*
**
*
Film (PMMA)
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ApplicationsSuitable for live tissues◦Polymeric bandage on wounds◦Sterilizes
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Research QuestionWhat indicator would be suitable to use under
PECVD conditions that would produce a colored film?
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Equipment Setup
Color Indicator
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Setup
Flow Controllers
Power Supply
Multimeter
Substrate(film produced here)
Bubbler (MMA) Plasma Jet
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ExperimentsSolubility of methyl blue on MMAStability of methyl blue after plasma ejectionCondition of power supply (i.e. voltage, frequency, etc)Functionality of methyl blue on PMMA
If it works…Test other color indicators ◦methyl red◦bromothymol blue
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Data generatedConditions to incorporate color indicator onto the
film◦Color indicator solvent/concentration◦Voltage◦Frequency of electricity◦Power◦Line spectra
Color indication
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Why a color film?pH sensitivity of the film
Ability to indicate chemical/metabolic changes or re-infection
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SummaryUse of low temperature plasma to deposit a film
Film is functional band-aid: compatible with live tissues, sterilizes and protects from re-infection
Film could indicate chemical/metabolic changes or re-infection
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AcknowledgementsDr. David StaackTsung-Chan “Cliff” TsaiTexas A&M UniversityMechanical Engineering Department◦Plasma Engineering and Diagnostics Laboratory
National Science Foundation (NSF)Enrichment Experience in Engineering (E3)
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Questions?