查看完整版本: J.Mater.Chem 杂志推荐出版2005年的热点纳米科技文章

J.Mater.Chem 杂志推荐出版2005年的热点纳米科技文章

[b][color=red]
[/color][/b]HOT NANAO Papers :hot

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[b]Synthesis of copper/cross-linked poly(vinyl alcohol) (PVA) nanocables via a simple hydrothermal route
[/b]Junyan Gong, Linbao Luo, Shu-Hong Yu, Haisheng Qian and Linfeng Fei, [b][i]J. Mater. Chem[/i][/b]., 2006, [b]16[/b], 101
DOI: 10.1039/b511721f

[quote]
1. [i]Could you explain the significance of your article to the non-specialist?
[/i]
Metal/insulator nanocables represent a new kind of nanostructure in the family of low dimensional nanomaterials, which have similar structures as that of the macroscopic cables (Cu, Al etc.), which have been widely used in industry and our daily lives. Copper is malleable, ductile, and a good conductor of heat and electricity (second only to silver in electrical conductivity), which is the most commonly used as an interconnector due to its high electrical conductivity. The successful access to copper/cross-linked nanocables is a key step for further investigation on their electrical conductivity and potential applications in connecting miniature electronics and the ultra-small components etc. This kind of nanocables could provide effective access to connecting components of super high-density integrated circuits and would be expected to be commercialised in the electronic industry.

2. [i]What has motivated you to conduct this work?
[/i]
Recently, a lot of efforts have been made to synthesize one dimensional nanowires and nanotubes. Copper is a metal presently used to create connecting wires in integrated circuits. The availability of copper nanowires with well-defined dimensions should be able to bring in new types of applications or enhance the performance of currently existing electric devices. In addition, the isolated shell deposited on the core (metal nanowires) could provide an effect method for preventing the oxidization from the viewpoint of applications. It is easily to fabricate the normal macroscopic cables by shelling the copper wires with an isolator such as rubber. However, how to fabricate the miniature cables with only several hundreds nanometers is not easy to achieve. Thus, this motivates us to do this work.

3. [i]Where do you see this work developing in the future?
[/i]
The successful access of flexible nanocables with copper, and silver, nanowire as the core and cross-linked PVA as shells could be of importance for the potential applications of such cables in the area of miniature electronics such as connecting miniature electronics and the ultra-small components. We can imagine that this kind of nanocable with similar structural features as normal cables should find more wide applications such as conductors of heat and electricity, connecting miniature electronics and the ultra-small components.

4. [i]Are there any particular challenges facing future research in this area?[/i]

Yes. There are indeed big challenges facing future research in this area. Even though we now can produce such nanocables with copper and silver as cores, and with cross-linked PVA, carbon as shells, the controlled synthesis process still needs to be optimized and the detailed growth mechanism is still not so clear at this stage. The ideal aim is to access individual and totally separated nanocables with high quality and in large scale. Furthermore, the application of this kind of nanocable should be explored and needs multidisciplinary efforts, for example, as connecting wires as we can imagine currently for the application scope of macroscopic cables in our daily life. The electronic properties (for example, resistance, electrical conductivity) of an individual cable with different thickness of the isolator shell, and the diameter of the core nanowire would be also very interesting.
[/quote]

2.  [b]Stable aqueous dispersions of graphitic nanoplatelets via the reduction of exfoliated graphite oxide in the presence of poly(sodium 4-styrenesulfonate)
[/b]Sasha Stankovich, Richard D. Piner, Xinqi Chen, Nianqiang Wu, SonBinh T. Nguyen and Rodney S. Ruoff, [b][i]J. Mater. Chem[/i][/b]., 2006, 16, 155 ;  DOI: 10.1039/b512799h
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[quote]
1. [i]Could you explain the significance of your article to the non-specialist?
[/i]
Graphite, an all carbon material, has a layered structure consisting of stacked sheets that are 1-atom thick and in which the C atoms are linked together in a hexagonal framework with sp2 bonding. Delamination of graphite into individual sheets is difficult and has never been achieved before. In the current work, we have discovered a method to produce isolated nanoplatelets in water dispersions and to prevent their agglomeration by coating them with a polymer that has affinity for both the sheets and for water. This strategy may eventually allow for the exfoliation of individual sheets that can be manipulated in water dispersions.

2. [i]What has motivated you to conduct this work?
[/i]
The in-plane properties of graphite are remarkable (excellent thermal and electrical conductivity as well as outstanding mechanical properties) and one may expect that to hold for individual sheets, or thin ‘graphitic nanoplatelets’, as well. Such objects would be “chemically tunable” by a full repertoire of organic reactions, allowing for chemical functionalization and subsequent modification with a wide range of functional properties. Provided that they can be obtained by a scalable method and chemically manipulated, such thin sheets and nanoplatelets could serve as a viable and inexpensive alternative to carbon nanotubes for a variety of applications such as fillers for polymer composites or as devices in nanoelectronics (graphite is a commodity material available at dollars per pound).

3. [i]Where do you see this work developing in the future?[/i]

We envision the development of a new class of materials.

[i]4. Are there any particular challenges facing future research in this area?[/i]

An exciting challenge is the chemical tuning of individual sheets of graphite or of graphitic nanoplatelets to adapt them for a host of applications and to create new functional materials.
[/quote]

3. [b]Kinetically controlled formation of a novel nanoparticulate ZnS with mixed cubic and hexagonal stacking[/b]
Hengzhong Zhang, Bin Chen, Benjamin Gilbert and Jillian F. Banfield, J[b][i]. Mater. Chem.,[/i][/b] 2006, [b]16[/b], 249
DOI: 10.1039/b512580d
[img]http://img296.imageshack.us/img296/8421/b512580dgarn5.gif[/img]
[quote]
1. [i]Could you explain the significance of your article to the non-specialist?[/i]

Zinc sulfide (ZnS) is a semiconductor that finds applications in many fields, e.g. it is used for fluorescent displays. In our work, we made a new ZnS material that is ultrafine (~ 5 nm) and different in structure from the traditional ZnS materials currently employed in industry. Unlike the traditional ZnS materials that exist either in sphalerite or wurtzite structures, the new material is a blend of the two. Due to its novel optoelectronic properties, this material can find applications in many new fields such as nanodevices, e.g. solar cells and sensors based on nanomaterials.

2. [i]What has motivated you to conduct this work?
[/i]
We have been studying nanoparticles of significance to both the environment and technology for many years. Nano-ZnS is one of the systems with relevance in both areas. Detailed structural information for ZnS nanoparticles is fundamental to both the technical applications and the understanding of the natural material. In the nature, nanoparticulate ZnS can be produced by sulfur reducing bacteria in anaerobic systems containing traces of zinc ions. The ZnS sulfide formed as a byproduct of microbial sulphate reduction are nanoparticles that sometime show complex mixed stacking characteristics. In technology, ZnS is an optoelectronic semiconductor that finds applications in many fields. Manipulation of the stacking order may provide a route to improve the performance of ZnS devices/materials. For this purpose, we tried to control the ZnS product by systematically changing the synthesis conditions.

3.[i] Where do you see this work developing in the future?[/i]

We foresee that this novel material will find new applications in many fields. A detailed and comprehensive investigation of its electronic and structural properties is the first step toward such applications. The second step is then to design and develop nanodevices using the novel material, based on the knowledge obtained from the first step.

[i]4. Are there any particular challenges facing future research in this area?[/i]

Nanoparticles often aggregate, bind with organic molecules, and/or adsorb water and/or inorganic ions in order to lower the free energy. This is especially true for small nanoparticles, e.g. 3-5 nm nanoparticles such as those produced in our work. If it is not possible to prevent such interactions, particle-particle and particle-adsorbate interactions may lead to structural changes over time, thus decline in device performance. It is challenging to derive electronic information from nanoparticles because the measurements include the contributions from both the nanoparticles and the surface environment. It may be possible to address this problem through extensive computational study and modelling of the experimental data.
[/quote]

4[b].DNA-mediated assembly of iron platinum (FePt) nanoparticles
[/b]Sudhanshu Srivastava, Bappaditya Samanta, Palaniappan Arumugam, Gang Han and Vincent M. Rotello, [b]J. Mater. Chem[/b]., 2007, [b]17[/b], 52
DOI: 10.1039/b613887j
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[quote]
[i](1) Could you explain the significance of your article to the non-specialist?[/i]

Biomaterials provide structural building blocks and functional properties that are difficult or impossible to replicate using current synthetic methodology. In our study, we used DNA to provide controlled assembly of magnetic nanoparticles. In these assemblies, the DNA regulates interparticle spacing, providing control over the magnetic properties of the resulting materials.

([i]2) What has motivated you to conduct this work?[/i]

Integration of biomolecular structure and function with nanomaterials provides a highly promising approach to creating highly complex functional systems. DNA provides an attractive building block for this strategy due to its structure and highly specific recognition properties.

([i]3) Where do you see this work developing in the future?[/i]

This current study uses the structure but not the coding capabilities of the DNA. Future research will use the high specificity of DNA recognition to provide programmed assembly of complex materials.

[i](4) Are there any particular challenges facing future research in this area?[/i]

The key challenge for the field of bionanotechnology is the proper engineering of the interface between the biomolecule and the synthetic construct. Non-specific interactions, denaturation, and other concerns very often compromise the function of the overall system. Controlling the interface requires an understanding of biology, synthesis, and materials science, making this a highly fruitful frontier for interdisciplinary science.
[/quote]


[b]5. Atomic layer deposition of polyimide thin films[/b]
Matti Putkonen, Jenni Harjuoja, Timo Sajavaara and Lauri Niinistö, J. Mater. Chem., 2007
DOI: 10.1039/b612823h
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[quote]

[b]Matti Putkonen[/b], currently working at Beneq Oy in Vantaa, Finland, explains the significance of and motivation behind his recent Journal of Materials Chemistry hot paper.

[i]Could you explain the significance of your article to the non-specialist?[/i]

Atomic layer deposition (ALD) has traditionally been used for the deposition of inorganic materials, such as metals as well as metal oxides, nitrides and sulfides. Polyimide thin films are attractive materials due to their resistance towards high temperatures, mechanical stress and various chemicals. We have demonstrated surface-controlled ALD-type growth of several polyimide thin films at 160 °C. Surface reactions between these precursors produce water that can be easily removed under reduced pressure during the ALD cycling. Therefore ALD processed polyimide thin films do not need post-deposition imidisation treatments at elevated temperatures that could lead to film cracking. Based on the present study, ALD may offer a conformal method to produce polyimide thin films for future microelectronics and especially MEMS devices.
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[i]What has motivated you to conduct this work? [/i]

The ALD research group at the Helsinki University of Technology (TKK), the Laboratory of Inorganic and Analytical Chemistry, has over 20 years of experience in ALD technology. During the past 10 years or so the focus has been on oxide materials needed for microelectronic and other devices, for example, high-k dielectrics or materials for gas sensors. A continuing research has been maintained to develop and test new precursors for important inorganic film materials. However, ALD has been studied only a limited extent for the deposition of the polymer thin films. We have previously demonstrated that both dianhydride and diamine precursors can attach to the high-surface area silica in a self-limiting manner. This observation and the expertise gained over the years prompted us to combine ALD technology with the existing volatile precursors, in order to develop an ALD process for polyimide thin films.

[i]Where do you see this work developing in the future? [/i]

Based on the success of the present work, the properties of polyimide thin films can be tailored, since there is wide selection of different functional diamines and dianhydrides. In addition, ALD deposition of organic–inorganic hybrid materials should be feasible.

[/quote]

[[i] 本帖最后由 nanosurface 于 2006-12-17 02:14 编辑 [/i]]

要是能把这几篇文章传上来就好了 呵呵