題目： Growing single crystals and films of Prussian Blue　analogues and using them for sensors





講師： Prof. J. V. Yakhmi

　　　（Bhabha Atomic Research Centre）



日時： 2006年10月26日（木）16時00分から



場所： 理学部　Ｅ211号室



要旨：

Jatinder Yakhmi 先生はインドのBhabha Atomic Research Centre のアソシエイトディレクター兼物理工学Jatinder Yakhmi 先生はインドのBhabha Atomic Research Centre のアソシエイトディレクター兼物理工学部門長で、超伝導材料、分子磁性材料とともに、自己組織化を巧みに利用したさまざまな材料について、物理、化学の境界を越えた機能材料開発に多くの業績をあげておられる著名な研究者です。ここでは、その中で特にプルシアンブルー磁性体やその類似体に関する、新しい機能材料への展開についてご講演いただきます。





Abstract:



Analogues of Prussian Blue, the cubic transition metal hexacyanometalates have many useful properties such as zeolitic structure, electrocatalytic activity, and magnetism, etc. [1,2]. Using LB technique, we have grown crystals (size 50-300 nm) of Prussian Blue Analogues (PBA), by employing a Langmuir monolayer of octadecyl amine (ODA) as a template at the air-water interface [3,4]. Magnetization data on nickel and iron hexacyanochromate films (thickness of 100–300 nm) having their cubic crystals oriented in {1 0 0} direction in the crystalline film indicated ferromagnetic behaviour below Curie temperatures of 72 and 21 K, respectively [5].



To integrate nanoparticles into functional devices, one needs to improve their processibility. For this purpose, sodium hexametaphosphate (HMP) stabilized nickel hexacyanoferrate (NiHCF) nanoparticles (average size 22 nm) were prepared in aqueous solution and extracted into an organic phase using cetyltrimethylammonium bromide (CTAB) as the surfactant, facilitating multilayered deposition of the surfactant-encapsulated nanoparticles using the LB technique [6]. These films were used to sense K+ ions by monitoring their electrochemical response [7].



We shall also discuss the synthesis of a Polyaniline-Prussian Blue Hybrid [8], and DNA templated supramolecular self-assembly of nickel hexacyanoferrate (NiHCF) nanocrystals in different morphologies induced by change in temperature of a double stranded Calf thymus DNA (CT-DNA)[9].



1. Widmann, Kahlert, Wulff, Bagkar, Yakhmi and Scholz, Inorg. Chem. 41, No. 22 (2002) 5706-5715

2. Bagkar, Widmann, Kahlert , Yusuf, Ravikumar, Scholz and Yakhmi, Phil. Mag (85 (2005) 3659-3672

3. Choudhury, Bagkar, Dey, Subramanian and Yakhmi, Langmuir 18 (2002) 7409-7414

4. Choudhury, Dey and Yakhmi, J. of Crystal Growth 258 (2003) 197-2035

5. Bagkar, Choudhury, Kim, Chowdhury, Lee and Yakhmi, Thin Solid Films (2006) Accepted

6. Bagkar, Ganguly, Choudhury, Hassan and Yakhmi, J. of Mater. Chem. 14 (2004) 1430-36

7. Bagkar, Betty, Hassan, Kahali, Bellare and Yakhmi, Thin Solid Films 497 (2006) 259-266

8. Sawant, N. Bagkar, Subramanian and Yakhmi, Phil. Mag. B 84 (2004) 2127-2138

9. Bagkar, Choudhury, Bhattacharya and Yakhmi, ChemComm. (submitted)



担当： 理学研究科　秋田　素子（7419）



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