Photoluminescence of polydiacetylene membranes on porous silicon utilized for chemical sensors

Eyal Sabatani*, Yehoshua Kalisky, Amir Berman, Yuval Golan, Nadav Gutman, Benayahu Urbach, Amir Sa'ar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Langmuir-Blodgett (LB) films of the conjugated polydiacetylene (PDA) exhibit spectroscopic behavior, which is dependent on the type of the supporting substrate. While on polished silicon surfaces the photoluminescence (PL) of PDA is quenched, it is preserved on top of 2D patterned macro-porous silicon (2D-MPS). 2D-MPS, prepared by electrochemical etching of photo-lithographically pre-patterned silicon, is a 2D array of ca. 10 μm deep pores with lateral 2-4 μm repeating unit cells in orthogonal or hexagonal arrangements. LB films of PDA on such surfaces form membranes with continuous domains of the size sufficient to cover laterally many cell units. Apparently, the PL from this film results exclusively from the portion of the PDA membrane which is suspended over pore openings, while portions of the film which are attached to the silicon on top of the pores walls does not exhibit PL at all. We have used these membranes in different configurations and exposed them to different chemical and biological agents and followed the PL intensity change. This report demonstrates the effectiveness of the combined system: LB films of PDA on top of 2D-MPS as sensing probe for a variety of chemicals including, Cd ions and TNT explosives. In addition, the use of films of PDA, in which glycol-lipid were embedded, for binding and recognition of lectin protein, mimicking the cell membrane interaction with its environment, is also demonstrated.

Original languageAmerican English
Pages (from-to)1766-1774
Number of pages9
JournalOptical Materials
Issue number11
StatePublished - Jul 2008

Bibliographical note

Funding Information:
The authors sincerely thank Mrs. Lubov Burlaka for her assistance with SEM analysis and Mrs. Roxana Golan for her assistance with AFM analysis. This research was supported by the Ministry of Science, Culture and Sport under Project 3-811.


  • Chemical sensor
  • Concanavalin-A
  • Glycopyranosile
  • Langmuir-Blodgett
  • Photoluminescence
  • Polydiacetylene
  • Porous silicon


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