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| 2. |
- Loog, O, et al.
(författare)
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Synthesis of hydrazines with aromatic substituents using triarylbismuth reagents
- 2000
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Ingår i: SYNTHESIS-STUTTGART. - : GEORG THIEME VERLAG. - 0039-7881. ; :11, s. 1591-1597
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Tidskriftsartikel (refereegranskat)abstract
- Smooth monoarylation of two triprotected hydrazine reagents under mild conditions has been accomplished using triaryl-bismuthanes in the presence of copper acetate and amine to give products 3 and 6 in excellent yield. Arylation on N-2 after selective dep
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| 3. |
- Maeorg, U, et al.
(författare)
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Synthesis of substituted hydrazines from triprotected precursors
- 1999
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Ingår i: ACTA CHEMICA SCANDINAVICA. - : MUNKSGAARD INT PUBL LTD. - 0904-213X. ; 53:12, s. 1127-1133
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Tidskriftsartikel (refereegranskat)abstract
- Full details related to the preparation and application of two triprotected reagents, 1,2,2-Boc(3)-hydrazine (1) and 1,2-Boc(2)-2-Z-hydrazine (2), for stepwise synthesis of substituted hydrazines are presented. In the presence of base these compounds unde
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| 5. |
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| 8. |
- Tatte, T, et al.
(författare)
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Metal oxide based SPM tips prepared by sol-gel method
- 2002
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Ingår i: Physics of Low-Dimensional Structures. - 0204-3467. ; 5-6, s. 31-37
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Tidskriftsartikel (refereegranskat)abstract
- Up to date SNOM tips have. been prepared from SiO2 based materials using etching or locally melt fibre's stretching for tip sharpening [1,2] Usage of other metal oxides has been restricted because of the lack Of methods for obtaining the tips with suitable geometrical configuration. In our previous work we have proposed the technique for preparing transparent and electroconductive SnO2 fibres and tips by sol-gel method [3]. In the present investigation we have demonstrated that the sol-gel method provides the wide range of metal oxides to obtain SPM fibre tips. The new method of preparation enables to study tips based on oxide or oxide mixtures to create sensors with new properties for different applications. We propose some methods for preparing suitable precursors for spinning of pure and mixed TiO2, SnO2, SiO2 fibres. In those new methods the sharpening of tips is achieved in fibre drawing procedure. That is carried out at room temperature in humid atmosphere and then fibres are baked at 300-700degreesC for crystallisation of the material.
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| 9. |
- Tatte, T, et al.
(författare)
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Transparent and conductive Sb-doped tin oxide SPM tips prepared by sol-gel method
- 2002
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Ingår i: Materials Science and Engineering C: Materials for Biological Applications. - 0928-4931. ; 19:1-2, s. 101-104
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Tidskriftsartikel (refereegranskat)abstract
- The rapid progress in scanning probe microscopy (SPM) techniques in the last decade has induced an increasing need for manufacturing advanced SPM tips. One important case is conductive and transparent tips. For such tips, only a few techniques have been proposed. which are either expensive or have poor reproducibility. We here propose a simple and cheap sol-gel technique to prepare fibers with a suitably sharp apex so that they can be used as SPM tips. The fibers were spinned off from a high-viscosity solution of tin alkoxide and SbCl3 hydrolysed in hurnid air and baked at 520 degreesC for several hours. The radii of the resulting tips were estimated by transmission electron microscopy to be less than 50 am. The resistivity of the transparent fibers was measured using different Sb-doping (0.5-1 wt.%) of the tin oxide, The temperature dependence of the conductivity and light absorption were investigated down to liquid He temperatures.
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