Electrospun light emitting polymer nanofibers

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Corinna Alfano
4 anni fa
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Luana Persano, Roberto Cingolani, Dario Pisignano andrea.camposeo@cnr.

1 Soft Matter Nanotechnology Group Electrospun light emitting polymer nanofibers Andrea Camposeo, Stefano Pagliara, Francesca Di Benedetto, Deyu Tu, Alessandro Polini, Elisa Mele, Luana Persano, Roberto Cingolani, Dario Pisignano National Nanotechnology Laboratory of CNR Istituto NANOSCIENZE, Lecce Italy XCVI CONGRESSO NAZIONALE Bologna, 21 Settembre 2010

2 Outline Introduction: electrospinning Conjugated polymer nanofibers Patterning of polymer nanofibers Nanofiber based devices Optical trapping of nanofibers Conclusions

3 1D Nanomaterials The miniaturization trend in photonics demand the development of components of sub wavelength size for light generation, confinement, guiding, and detection. Organic and inorganic nanowires are 1D elements capable of realizing both active and passive photonic circuits Applications: chemical sensors PIC optical devices, organic field effect transistors Technologies: self assembly interfacial polymerization template synthesis electrospinning 1) M. L. Chabinyc, D. T. Chiu, J. C. McDonald, A. D. Stroock, J. F. Christian, A. M. Karger, G. M. Whitesides, Anal. Chem. 2001, 73, 4491; 2) B. Yao, G. Luo, L. Wang, Y. Gao, G. Lei, K. Ren, L. Chen, Y. Wang, Y. Hub, Y. Qiubc, Lab Chip 2005, 5, ) S. Pagliara, A. Camposeo, A. Polini, R. Cingolani, D. Pisignano, Lab on Chips 9, 2851 (2009).

4 ES process parameters System parameters viscosity, solution concentration, conductivity, surface tension, molecular weigth, polymer structure Operational parameters electric field strength, injection flow rate, capillary target distance, capillary geometry Ambient parameters temperature, humidity D = fiber diameter; ү = surface tension; є = dielectric constant of outside medium; Q= flow rate; I =electric current; X = jet length/nozzle diameter D = Q γε I 2 2 π 2 2ln ( χ 3) Fridrikh et al. Phys. Rev. Lett. 90, (2003). 1 3

5 Introduction: electrospinning Conjugated polymer nanofibers Patterning of polymer nanofibers Nanofiber based devices Optical trapping of nanofibers Conclusions

6 Light emitting Nanofibers F. Di Benedetto, A. Camposeo, S. Pagliara, E. Mele, L. Persano, R. Stabile, R. Cingolani, D. Pisignano, Nature Nanotechnol. 3, 614 (2008). S. Pagliara, A. Camposeo, R. Cingolani, D. Pisignano Appl. Phys. Lett., 95, , 2009.

Non radiative energy transfer K ET 6 2 χρr0π 1 1 = 2τ 8a R H 3 3 R κ η dν = 4 ν 2 D 0 0.

7 Non radiative energy transfer K ET 6 2 χρr0π 1 1 = 2τ 8a R H 3 3 R κ η dν = 4 ν 2 D F ( ν ) σ ( ν ) 4 H D n N AV 1/ 6 A. Camposeo, F. Di Benedetto, R. Cingolani, D. Pisignano, Appl. Phys. Lett. 94, (2009).

8 A. Camposeo, F. Di Benedetto, R. Cingolani, D. Pisignano, Appl. Phys. Lett. 94, (2009). White emission

9 Introduction: electrospinning Conjugated polymer nanofibers Patterning of polymer nanofibers Nanofiber based devices Optical trapping of nanofibers Conclusions

Patterning by RT NIL Masters with period in the range 400 600 nm and height in

pressure in the range 240 290 MPa F. Di Benedetto, A. Camposeo, S. Pagliara, E.

10 Patterning by RT NIL Masters with period in the range nm and height in the range nm fabricated by electron beam lithography Typical applied pressure in the range MPa F. Di Benedetto, A. Camposeo, S. Pagliara, E. Mele, L. Persano, R. Stabile, R. Cingolani, D. Pisignano, Nature Nanotechnol. 3, 614 (2008).

Patterning by RT NIL Feature height in the range 100

Pisignano, Nature Nanotechnol. 3, 614 (2008). S.

11 Patterning by RT NIL Feature height in the range nm, matching the features of the master F. Di Benedetto, A. Camposeo, S. Pagliara, E. Mele, L. Persano, R. Stabile, R. Cingolani, D. Pisignano, Nature Nanotechnol. 3, 614 (2008). S. Pagliara, A. Camposeo, E. Mele, R. Cingolani, D. Pisignano, Nanotechnology, 21, , 2010.

12 F. Di Benedetto, A. Camposeo, S. Pagliara, E. Mele, L. Persano, R. Stabile, R. Cingolani, D. Pisignano, Nature Nanotechnol. 3, 614 (2008). Bragg Scattering

13 Introduction: electrospinning Conjugated polymer nanofibers Patterning of polymer nanofibers Nanofiber based devices Optical trapping of nanofibers Conclusions

14 Polarized emission Fiber emission is polarized along the fiber longitudinal axis S. Pagliara, A. Camposeo, A. Polini, R. Cingolani, D. Pisignano, Lab on Chips 9, 2851 (2009).

15 D. Tu, S. Pagliara, A. Camposeo, L. Persano, R. Cingolani, D. Pisignano, Nanoscale, 2, 2217 (2010) Molecular Alignment: FTIR

16 S. Pagliara, A. Camposeo, A. Polini, R. Cingolani, D. Pisignano, Lab on Chips 9, 2851 (2009). Polarized light source

17 Organic FET MEH PPV, p type Light emitting conjugated polymer W = 500 nm L = 7 μm μ = 10-3 cm 2 /Vs I on /I off = 100 V TH = - 6 V D. Tu, S. Pagliara, A. Camposeo, L. Persano, R. Cingolani, D. Pisignano, Nanoscale, 2, 2217 (2010)

18 Introduction: electrospinning Conjugated polymer nanofibers Patterning of polymer nanofibers Nanofiber based devices Optical trapping of nanofibers Conclusions

19 Optical Trapping Theory based on T Matrix formalism University of Messina and CNR IPCF of Messina by Prof. F. Borghese and Dr. O. M. Maragò A.A.R. Neves, A. Camposeo, S. Pagliara, R. Saija, F. Borghese, P. Denti, M. A. Iatì, R. Cingolani, O.M. Maragò, D. Pisignano, Optics Express 18, 822 (2010).

20 Conclusions Electrostatic spinning light emitting polymer nanofibers Patterning fibers through room temperature nanoimprint lithography has been carried out Light emitting nanofiber arrays has been exploited as excitation sources in microfluidic devices

21 Acknowledgments Apulia Regional Strategic Project PS_144 Contract RBIP06SH3W Soft Matter Nanotechnology Group

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