Showing Spotlights 1225 - 1232 of 2428 in category All (newest first):
Vertical arrays of carbon nanotubes, called 'forests', are a common type of three-dimentional (3D) nanotube assembly that researchers work with in their labs. These forests can be produced by chemical vapor deposition technique and used for diverse applications such as in photo- or thermoacoustics, highly elastic conductive composites, for mechanical nanomanipulation, in catalysis, or as sensors in nanomedicine, just to name a few examples. These and other applications relay on connectivity of carbon nanotubes in the forest structure. New measurements show that room temperature electrical properties of this nanotube network reveal quite substantial nonlinerarities that became more pronounced at sample cooling.
Oct 7th, 2011
A single drop of water can be fatal to electrical circuits. To prevent water damage, current electronic devices are well sealed and packaged with polymer passivation. Researchers in Korea have now gone one step further and made water resistance a feature of the device itself by incorporating nonwetting, superhydrophobic components into the electronic device. They demonstrated this novel idea with a source/drain structure in a thin-film transistor. This work combines superhydorphobicity with electronic devices, especially resistive switching memory devices. Although much research has been done on either topic, few works report the combination of combining superhydrophobicity and electronic devices. This is a novel approach to combine two different concepts to get a synergic effects.
Oct 5th, 2011
Back in 2008 we reported on nanotechnology solution for radioactive waste cleanup, specifically the use of titanate nanofibers as absorbents for the removal of radioactive ions from water. Now, the same group that developed these nanomaterials reports in a new study that the unique structural properties of titanate nanotubes and nanofibers make them superior materials for removal of radioactive cesium and iodine ions in water. Based on their earlier work, the researchers have now demonstrated a potentially cost-effective method to remediate cesium and iodine ions from contaminated water by using the unique chemistry of titanate nanotubes and nanofibers to chemisorb these ions.
Oct 4th, 2011
In recent years various bottom-up processes (such as growth techniques) and top-down processes (such as electron beam, lithography, nanoimprint) have been used to produce one dimensional nanostructure on semiconductor substrate. All these approaches involve nanoscale prepatterning or extreme fabrication conditions; hence, they are often limited by associated high cost and low yield. In a novel nanomanufacturing process known as Simultaneous Plasma-Enhanced Reactive Ion Synthesis and Etching (SPERISE), researchers have integrated both nanoscale bottom-up synthetic and top-down etching approach. This eliminates the expensive prepatterning steps and hence give rise to ultrahigh throughput, better reliability, high yield and above all, low cost.
Oct 3rd, 2011
Carbon nanotubes (CNTs) have not yet met commercial expectations from a decade ago, and now hot on its heels is graphene. Graphene is considered a hot candidate for applications such as computers, displays, photovoltaics, and flexible electronics. The biggest opportunity for both materials is in printed and potentially printed electronics. In a comparably short time a large amount of graphene materials have become commercially available contributing to further advancements and application development. At a fraction of the weight and cost of CNTs, graphene may displace carbon nanotubes and even indium tin oxide in some applications. Flexible, see-through displays may be the one application that finally puts graphene into the commercial spotlight.
Sep 28th, 2011
Despites huge research funding for photovoltaics, contribution of solar cells to energy market is still negligible. The major obstacle is high production cost of silicon solar cells: current solar cell market is dominated by silicon technology. Bulky and rigid silicon solar cell with a power conversion efficiency above 10% and a lifetime of 25 years have become the benchmark in photovoltaic industry. However, there are plenty of scopes for disposable and inexpensive solar cells with a moderate efficiency and a shorter lifetime, which can be compared with plant leaves with a typical efficiency of 3-7% and a lifetime less than a year. Here is an example of research that was motivated to produce cheap and disposable solar cells with a moderate power conversion efficiency.
Sep 26th, 2011
Today we are going to tackle a general topic that deals with how data is represented in scientific papers. The use of illustrations in scientifi c publications is a longstanding tradition that goes back thousands of years. In the course of writing 1,200 Nanowerk Spotlights over the past six years, we have worked our way through thousands of papers. And if one thing has stood out, it is the quality of the illustrations included in these papers: some are just excellent and capture the essence of the findings; others, well, let's just say they could be improved upon. Here are five specific recommendations on how scientists should design effective figures.
Sep 22nd, 2011
Every aspect of cellular activities, including cell proliferation, differentiation, metabolism and apoptosis, can be regulated by a class of tiny but very important nucleic acids fragments called microRNAs (miRNAs). They bind to specific messenger RNAs and cause messenger RNA degradation or inhibit translation, thereby regulate gene expression at the post-translational level. In cancer cells, the homeostasis of these normal biological processes is disrupted, partially by dysregulated miRNAs, therefore the level of microRNAs is an indicator to the disease development, and miRNAs in cancer tissues or biofluids can be utilized as a diagnostic biomarker for cancer detection. Now, researchers report a miRNAs-based discovery that could provide a much earlier warning signal for lung cancer.
Sep 20th, 2011