층상자기조립법을 이용한 나노구조체의 제조와 응용 = Preparation of Nanostructures Using Layer-by-Layer Assembly and Applications

다국어 초록 (Multilingual Abstract)

We introduce a novel and versatile approach for preparing self-assembled nanoporous multilayered films with antireflective properties. Protonated polystyrene-block-poly (4-vinylpyrine) (PS-b-P4VP) and anionic polystyrene-block-poly (acrylic acid) (PS-b-PAA) block copolymer micelles (BCM) were used as building blocks for the layer-by-layer assembly of BCM multilayer films. BCM film growth is governed by electrostatic and hydrogen-bonding interactions between the oppositely BCMs. Both film porosity and film thickness are dependent upon the charge density of the micelles, with the porosity of the film controlled by the solution pH and the molecular weight (Mw) of the constituents. PS7K-b-P4VP28K/PS2K-b-PAA8K films prepared at pH 4 (for PS7K-b-P4VP28K) and pH 6 (for PS2K-b-PAA8K) are highly nanoporous and antireflective. In contrast, PS7K-b-P4VP28K/PS2K-b-PAA8K films assembled at pH 4/4 show a relatively dense surface morphology due to the decreased charge density of PS2K-b-PAA8K. Films formed from BCMs with increased PS block and decreased hydrophilic block (P4VP or PAA) size (e.g., PS36K-b-P4VP12K/PS16K-b-PAA4K at pH 4/4) were also nanoporous. Furthermore, we demonstrate that the nanostructured electrochemical sensors based on patterning methods show the electrochemical activities. Anionic poly(styrene sulfonate) (PSS) layers were selectively and uniformly deposited onto the catalase (CAT)-coated surface using the micro-contact printing method. The pH-induced charge reversal of catalase can provide the selective deposition of consecutive PE multilayers onto patterned PSS layers by causing the electrostatic repulsion between next PE layer and catalase. Based on this patterning method, the hybrid patterned multilayers composed of platinum nanoparticles (PtNP) and catalase were prepared and then their electrochemical properties were investigated from sensing $H_2O_2$ and NO gas. This study was based on the papers reported by our group. (J. Am. Chem. Soc. 128, 9935 (2006); Adv. Mater. 19, 4364 (2007); Electro. Mater. Lett. 3, 163 (2007)).

참고문헌 (Reference)

1 S. L. Clark, 30 : 7237-, 1997

2 F. Patolsky, 15 : 3703-, 1999

3 S. L. Clark, 11 : 1031-, 1999

4 I. Lee, 14 : 572-, 2002

5 H. Zheng, 14 : 569-, 2002

6 X.-P. Jiang, 13 : 1669-, 2001

7 D. M. Sullivan, 123 : 11805-, 2001

8 S. T. Dubas, 123 : 5368-, 2001

9 H. H. Rmaile, 125 : 6602-, 2003

10 B. W. Stanton, 19 : 703B-, 2003

11 F. Caruso, 282 : 1111-, 1998

12 G. Ibarz, 13 : 1324-, 2001

13 Z. Dai, 13 : 1339-, 2001

14 E. Donath, 37 : 2201-, 1998

15 J. Hiller, 1 : 59-, 2002

16 J. Hong, 19 : 4364-, 2007

17 A. Yu, 75 : 3031-, 2003

18 A. Yu, 3 : 1203-, 2003

19 J. Park, 20 : 1843-, 2008

20 G. Decher, 46 : 321-, 1991

21 G. Decher, 277 : 1232-, 1997

22 G. K. Such, 128 : 9318-, 2006

23 S.-F. Chong, 5 : 2601-, 2009

24 S. Lee, 131 : 2579-, 2009

25 J. Cho, 128 : 9935-, 2006

26 J. Cho, 3 : 163-, 2007

27 S. L. Clark, 10 : 1515-, 1998

28 D. Buttry, "Advances in electroanalytical chemistry: Applications of the QCM to electrochemistry" Marcel Dekker 24-32, 1991