Quasi one-dimensional photonic crystals based on refractive index control of polymer nanofibers


Project Director: Dr. Monica Enculescu
Project ID:
PN-II-RU-TE-2011-3-0107
Project Director:
Dr. Monica Enculescu
Project Type:
National
Project Program:
HUMAN RESOURCES, TE
Funded by:
Romanian National Authority for Scientific Research, UEFISCDI
Contractor:

National Institute of Materials Physics

 

Project Status:
Finished
Start Date:
Saturday, 1 October, 2011
End Date:
Wednesday, 1 October, 2014
Project Abstract:

 

The scientific goal of the project is to obtain quasi one-dimensional photonic crystals based on polymer nanofibers. One characteristic of a photonic crystal is the periodicity over one or more axes. In principle, photonic crystals are periodic optical nanostructures that affect and change the propagation of photons. The aim of the project is to produce by electrospinning dye-doped polymer nanofibers incorporating uniformly dispersed metal or semiconductor nanoparticles. By doping the polymer with dyes and further co-doping with nanoparticles we will be able to tailor both the refractive index and the luminescent properties of the material. A photonic crystal band gap will be produced, similar to the semiconductor band gap. The features of the electrospinning process allow us (by the process parameters such as applied voltage, distance from the anode to cathode, viscosity of the polymer solution etc.) to vary the geometrical parameters of the polymer nanofibers. That will influence the optical properties of the material. Moreover, by varying the concentration of the dopants (particles/dye) and the size of the doping particles we can achieve periodic modulation of the refractive index. By controlling the setting of the nanoparticles into the dye-doped polymer nanofibers we will be able to produce a photonic band-gap material and to obtain a quasi one-dimensional photonic crystal out of a single doped polymer nanofiber.

 

Project Objectives:

The main objective of the proposed project is to produce by electrospinning dye-doped polymer nanofibers incorporating uniformly dispersed metal, semiconductor or insulating nanoparticles. By achieving this objective we intend to obtain quasi one-dimensional photonic crystals based on polymer nanofibers..

Various optical phenomena occur when light is propagating through periodically organized dielectric media. Thus, the photonic bandgaps and the changing of the refractive index induced by anisotropy of the material have perspective applications in controlling light.

The insertion of various nanoparticles in the polymer fibers is intended in order to tailor the optical properties such as refractive index, wavelength of the emission bands, absorption edge/cut-off wavelength. We intend to produce dye-doped polymer nanofibers in which a diversity of nanoparticles (metals, semiconductor, and insulators) will be inserted. Different dyes will be used in order to obtain dye-doped polymer fibers and to change the optical properties, both luminescence and refractive index. Moreover, metallic (Ag, Au), semiconducting (TiO2) and insulating (SiO2) nanoparticles can tailor the refractive index and the cut-off edge of our polymers and can modify the luminescent properties of the fibers.

The project is divided in 4 stages (each corresponding to a calendar year). For every stage we dedicated an yearly objective that will be accomplished by several activities. Table 1 is presenting the workplan of the project with proposed objectives/milestones and activities.

Stage IOptical properties of dye-doped polymers.
Objective 1Obtaining dye-doped polymers with controllable optical properties.
ActivitiesA.1.1. Synthesis of dye-doped polymer thin films by spin coating (testing the principle);

A.1.2. Establishing the influence of different dyes and their concentrations on the optical properties of dye- doped polymers.

Stage IIMorphological properties control of dye-doped polymer nanofibers.
Objective 2Synthesis of dye-doped polymer nanofibers by electrospinning.
ActivitiesA.2.1. Synthesis of PVP, PVA, and PMMA nanofibers by electrospinning - establishing the apppropiate electrospinning parameters;

A.2.2. Synthesis and morphological characterization of polymer nanofibers doped with dye (rhodamine 6G);

A.2.3. Determining the influence of the electrospinning process on the morphological properties of the rhodamine doped polymer nanofibers.

Stage IIIOptical properties control of dye-doped polymer nanofibers.
Objective 3Tuning the luminescent properties of dye-doped polymer nanofibers.

Activities

A.3.1. Synthesis of polymer nanofiber ( PVP, PVA, PMMA) doped with different dyes (coumarin, rhodamine, sulphorodamine);

A.3.2. Establishing the influence of the dye’s concentration on the luminescent properties of dye-doped polymer nanofibers;

A.3.3. Measurements of the refractive index of dye-doped polymer nanofibers.

Stage IV

Refractive index tuning with metal nanoparticles embedded in dye-doped polymer nanofibers.

Objective 4

Controlled modification of the dye-doped polymer nanofibers’refractive index

Activities

A.4.1. Synthesis of  dye-doped polymer nanofibers codoped with metallic (Ag, Au), semiconducting (TiO2), or insulating (SiO2) nanoparticles.

A.4.2. Establishing the influence of nanoparticles’diameter on the refractive index of the dye-doped polymer nanofibers codoped with

A.4.3. Achieving refractive index control of dye-doped polymer nanofibers codoped with various nanoparticles by uniform distribution of the codoping materials.

ParticipantNameAttributions in the project
Team Leader (TL).Dr. Monica Enculescu - CS IIpreparation by electrospinning of polymer nanofibers and dye-doped polymers nanofibers with embedded metallic nanoparticles; investigation of the morphological, compositional, structural and optical properties of pure and doped nanostructures by SEM, energy dispersive X-ray analysis, X-ray diffraction, optical spectroscopy; coordination and management activities;
Senior Researcher (SR). Dr. Ionut Enculescu – CS Ielectrospinning polymer nanofibers, evaluating morphological, compositional and optical properties, coordination activities;
Researcher (R).Dr. Nicoleta Preda – CS IIIsynthesis of doped and undoped polymers solutions; structure, compositional and optical measurements;
Post Doc (PD).Dr. Elena Matei – CS IIImeasurements regarding morphology and structure evaluation;
PhD Student (S).Camelia Florica - ASCcharacterization measurements, processing the results;
PhD Student (S).Alexandru Evanghelidis - ACSpreparation by electrospinning of polymer nanofibers;
List of Publications:

1. Luminescent micro- and nanofibers based on novel europium phthalate complex,

M. Enculescu, N. Preda, E. Matei, I. Enculescu

Materials Chemistry and Physics, Volume 136, Issue 1, pp. 51-58 (2012)

 

2. Self-assembled electrodeposited samarium oxide/zinc oxide nanostructured films with

intense, broad luminescence,

E. MateiM. Enculescu, I. Enculescu

Electrochimica Acta,  Volume 95, pp. 170-178  (2013)

 

3. Dependence of the dye's type and concentrration of the emissive properties of electrospun

dye-doped nanofibers

M. Enculescu, A. Evanghelidis, C. Busuioc, C. Florica, A. Costas, M. Oancea, N. Preda,

E. Matei, I. Enculescu

Digest Journal of Nnomaterials and Biostructures, 9 (2) (2014) 809-816

 

4. Influence of morphology on the emissive properties of dye-doped PVP nanofibers produced

by electrospinning

M. Enculescu, I. Evanghelidis, I. Enculescu

Journal of Physics and Chemistry in Solids, Manuscript number PCS-D-13-00970.

 

5. Structural and morphological evolutions induced by the annnealing of CaF2 nanocrystalline powders by

using Eu3+ probe luminescence

S. Polosan, M. Enculescu, M. Secu

Radiation Measurements, Manuscript Number: RADMEAS-D-14-00164R1

 

6. Optical and morphological properties of TiO2 doped polymer nanofibers produced by electrospinning

M. Enculescu, A. Evanghelidis, I. Enculescu

Materials Chemistry and Physics, Manuscript in preparation

 

Contribution to  international conferences:

 

Size Dependent Luminescence of Dye Doped Nanorods Obtained in Polymer Membranes

Monica Enculescu, Christina Trautmann

EMRS Spring Meeting 2011, 17-14 May 2011Nice, France

 

Functional Nanostructures Obtained in Ion Irradiated Templates

M. Enculescu, E. Matei, N. Preda, I. Enculescu, M.E. Toimil Molares, C. Trautmann, J-Ph.

Ansermet

EMRS Spring Meeting 2011, 17-14 May 2011Nice, France

 

Wet-chemical Synthesis of Luminescent Europium (III) Doped Nanofibers

Monica Enculescu, Nicoleta Preda, Elena Matei, Ionut Enculescu,

16th International Conference on Composite Structures ICCS 16, 28-30 June 2011, Porto,

Portugal

 

Low-dimensional structures with tailored light emitting properties

Enculescu M, Matei E, Preda N, Enculescu I

E-MRS 2012 Spring Meeting, 14-18 May 2012, Strasbourg, France

 

Emissive properties of dye-doped polymer thin films containing metallic nanostructures

Enculescu M, Matei E, Florica C, Preda N, Enculescu I

4th International Conference on NANO-structures SELF-Assembly (NanoSEA 2012), 25-29

June, Santa

Margherita, Cagliari, Italy

 

Influence of metallic nanostructures on the optical properties of dye-doped polymer thin films

Enculescu M, Matei E, Enculescu I, Trautmann C

TNT 2012- Trends in NanoTechnology Conference, 10-14 September, Madrid, Spain

 

Influence of nickel nanowires on the optical properties of dye-doped polymer films

M. Enculescu, E. Matei, N. Preda, C. Florica, I. Enculescu

E-MRS 2013 Spring Meeting, 27-31 May 2013, Strasbourg, France

 

Influence of the ZnO nanorods on the emissive properties of dye-doped polymer thin films

M. Enculescu, E. Matei, N. Preda, C. Florica, I. Enculescu

E-MRS 2013 Fall Meeting, 16-20 September 2013, Warsaw, Poland

 

Electrospun nanofibers with tuneable emissive properties

M. Enculescu, A. Evanghelidis, C. Busuioc, N. Preda, E. Matei, C. Florica, A. Costas, M. Oancea,

I. Enculescu

E-MRS 2014 Spring Meeting, Symposium Q: Hybrid materials engineering in biology, chemistry and

physics, 26-30 May 2014, Lille, France

Project Contact Person:

Dr. Monica Enculescu

Scientific Researcher II

Tel:           +40213690185

Fax:          +40213690177

 

Address:    National Institute of Materials Physics

Multifunctional Materials and Structures

PO Box MG-7, Magurele-Bucharest, 77125

Romania


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