Ilse Katz Institute for Nanoscale Science and Technology

Beersheba, Israel

Ilse Katz Institute for Nanoscale Science and Technology

Beersheba, Israel

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News Article | April 4, 2016
Site: phys.org

Their study will be published online in Nature Chemistry on April 4, 2016. "Creating and characterizing the world's smallest diode is a significant milestone in the development of molecular electronic devices," explains Dr. Yoni Dubi, a researcher in the BGU Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology. "It gives us new insights into the electronic transport mechanism." Continuous demand for more computing power is pushing the limitations of present day methods. This need is driving researchers to look for molecules with interesting properties and find ways to establish reliable contacts between molecular components and bulk materials in an electrode, in order to mimic conventional electronic elements at the molecular scale. An example for such an element is the nanoscale diode (or molecular rectifier), which operates like a valve to facilitate electronic current flow in one direction. A collection of these nanoscale diodes, or molecules, has properties that resemble traditional electronic components such as a wire, transistor or rectifier. The emerging field of single molecule electronics may provide a way to overcome Moore's Law— the observation that over the history of computing hardware the number of transistors in a dense integrated circuit has doubled approximately every two years - beyond the limits of conventional silicon integrated circuits. Prof. Bingqian Xu's group at the College of Engineering at the University of Georgia took a single DNA molecule constructed from 11 base pairs and connected it to an electronic circuit only a few nanometers in size. When they measured the current through the molecule, it did not show any special behavior. However, when layers of a molecule called "coralyne," were inserted (or intercalated) between layers of DNA, the behavior of the circuit changed drastically. The current jumped to 15 times larger negative vs. positive voltages—a necessary feature for a nano diode. "In summary, we have constructed a molecular rectifier by intercalating specific, small molecules into designed DNA strands," explains Prof. Xu. Dr. Dubi and his student, Elinor Zerah-Harush, constructed a theoretical model of the DNA molecule inside the electric circuit to better understand the results of the experiment. "The model allowed us to identify the source of the diode-like feature, which originates from breaking spatial symmetry inside the DNA molecule after coralyne is inserted." More information: Molecular rectifier composed of DNA with high rectification ratio enabled by intercalation, Nature Chemistry, DOI: 10.1038/nchem.2480


Rosenkrantz E.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ben - Gurion University of the Negev
Optics Letters | Year: 2014

The emerging technology of visible light communications (VLC) will provide a new modality of communication. This technology uses illumination lighting to carry information. We propose to add a smart capability to mitigate interferences from unwanted light sources. This is achieved by adaptively filtering interference light using a tunable filter to block interferences dynamically. In this Letter, we present an innovative concept for a tunable notch filter based on ferroelectric thin films embedded with noble metal nanoparticles. The adaptivity of the filter is achieved by controlling the external applied voltage. This voltage creates an electric field that changes the refractive index of the host film through the linear electro-optic effect. Moreover, the fundamental characteristics of the filter are determined by the layer's parameters, such as film thickness, nanoparticles concentration and geometry, and the material of both the host thin film and nanoparticles. We study the tunability of lead zirconate titanate (PZT) embedded with Ag nanoparticles that reaches approximately 50 nm, between 530 and 590 nm. Moreover, we showed that a PZT notch filter embedded with Ag nanoshells has its stop band shifted to shorter wavelengths. These tunable filters can be used as mode selectors inside a laser resonator, spatial light filters for imaging and communication both for VLC and infrared communication. © 2014 Optical Society of America.


Eliyahu S.,Ben - Gurion University of the Negev | Yerushalmi-Rozen R.,Ben - Gurion University of the Negev | Yerushalmi-Rozen R.,Ilse Katz Institute for Nanoscale Science and Technology
Chemical Communications | Year: 2010

Polymer-mediated depletion interactions were found to induce the assembly of fullerene derivates at the water-air interface into non-closed-packed 2-dimensional arrays of nanometric thickness. © 2010 The Royal Society of Chemistry.


Rosenkrantz E.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ben - Gurion University of the Negev
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

We present an innovative method for modulating light using a ferroelectric thin-film embedded with metal nanoparticles. Due to the electro-optic effect in ferroelectric PZT, changes in refractive index can be controlled by an external electric field. Consequently, the local surface plasmon resonance of embedded noble metal nanoparticles changes with the media's refractive index. As a result, their optical extinction cross-section is shifted and light passing through the film could be controlled. In other words, an external electric field could modulate light. Using Mie theory for spherical particles, we were able to approximate the metallic nanoparticle's diameter that generates the maximum optical contrast, at a given wavelength. In addition, to establish an accurate model, we considered the impact on plasmon resonance resulting from deformation of the nanoparticles. The deformation is caused by the piezoelectric property of the ferroelectric host material. We assumed 20 nm diameter Au or Ag nanoparticles embedded in a 1 μm thick PZT film. Simulations showed that these particles can reach an optical contrast of up to 12 dB, in the visible spectrum. In addition, deformation of particles had negligible impact on the shift in resonance frequency compared to the change in PZT refractive index. In this study we have shown that a nanocomposite comprising of nanoparticles embedded PZT thin film can perform as an optical modulator. This modulator will be able to achieve a high contrast with low power consumption. © 2013 SPIE.


Rosenkrantz E.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ben - Gurion University of the Negev
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Modulating retro-reflectors (MRR) are beneficial for asymmetric free-space optics communication links. An MRR includes an optical retro-reflector and an electro-optic shutter. The main advantage of an MRR configuration is that it shifts most of the power, weight, and pointing requirements onto one end of the link. In this study an innovative device comprising of nanoparticle-embedded ferroelectric thin film is used as an MRR. The new modulator is mounted in front of a passive retro-reflector. In our study we calculated the link budget for lunar exploration scenario. The scenario includes a base station that communicates with several robots or astronauts. In our simulations, the base station illuminates a robot with a continuous-wave beam, i.e. an interrogating beam. The un-modulated beam strikes the MRR, which is located on the robot, and is passively reflected back to the base station carrying the data that has been modulated onto it by the MRR. In this scenario a robot and a base-station are 4km apart, with a clear line of sight. In addition, the innovative MRR is capable of achieving 12dB contrast ratio. Under these assumptions and using the nanoparticle-embedded ferroelectric MRR we calculated the required transmission power for a given bit-rate and BER. © 2013 SPIE.


Xia L.,Ilse Katz Institute for Nanoscale Science and Technology | Xia L.,Qingdao University | Ravenna Y.,Ilse Katz Institute for Nanoscale Science and Technology | Alfonta L.,Ilse Katz Institute for Nanoscale Science and Technology
Chemical Communications | Year: 2015

To achieve an efficient electron transfer communication between bacteria and electrodes, several strategies including enzyme surface display, bacteria elongation as well as layer-by-layer assembly techniques were used to assemble bacteria, methylene blue, multiwall carbon nanotubes, and carbon papers into hierarchical micro/nano artificial biofilm based bioanodes. This journal is © The Royal Society of Chemistry 2015.


Szczupak A.,Ilse Katz Institute for Nanoscale Science and Technology | Kol-Kalman D.,Ilse Katz Institute for Nanoscale Science and Technology | Alfonta L.,Ilse Katz Institute for Nanoscale Science and Technology
Chemical Communications | Year: 2012

Laccase and bilirubin oxidase were successfully displayed on the surface of yeast cells. Subsequently, these modified yeast cells were used in the cathode compartment of a microbial fuel cell. The performance of the fuel cells is compared. © 2012 The Royal Society of Chemistry.


Rosenkrantz E.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ben - Gurion University of the Negev
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Visible light communication (VLC) is a new emerging technology that uses standard visible light to transmit broadband data streams in addition to illumination. In our research we have theoretically studied an innovative device that can serve as a modulating retro-reflector (MRR) for VLC applications. The device comprises of a nanocoposite of ferroelectric thin-film embedded with noble metal nano-shells. In comparison to the nano-spheres, the nano-shells provide more flexibility in the design of the device. This MRR can be used in asymmetric communication links as an optical transceiver for mobile devices. The main conclusion from our study is that a nanocomposite based MRR can save power, complexity, dimensions and weight in comparison to standard communication links. this fact is very important for mobile platforms. © 2014 SPIE.


Rosenkrantz E.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ilse Katz Institute for Nanoscale Science and Technology | Arnon S.,Ben - Gurion University of the Negev
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

Underwater optical wireless communication is an emerging technology, which can provide high data rate. High data rate communication is required for applications such as underwater imaging, networks of sensors and swarms of underwater vehicles. These applications pursue an affordable light source, which can be obtained by light emitting diodes (LED). LEDs offer solutions characterized by low cost, high efficiency, reliability and compactness based on off-the-shelf components such as blue and green light emitting diodes. In this paper we present our recent theoretical and experimental results in this field. © 2014 SPIE.


Home > Press > Novel anti-biofilm nano coating developed at Ben-Gurion U.: Offers significant anti-adhesive potential for a variety of medical and industrial applications Abstract: Researchers at Ben-Gurion University of the Negev (BGU) have developed an innovative anti-biofilm coating, which has significant anti-adhesive potential for a variety of medical and industrial applications. According to the research published in Advanced Materials Interfaces, anti-adhesive patches that are developed from naturally occurring biomaterials can prevent destructive bacterial biofilm from forming on metal surfaces when they are immersed in water and other damp environments. "Our solution addresses a pervasive need to design environmentally friendly materials to impede dangerous surface bacteria growth," the BGU researchers from the Avram and Stella Goldstein-Goren Department of Biotechnology Engineering explain. "This holds tremendous potential for averting biofilm formed by surface-anchored bacteria and could have a tremendous impact." The anti-adhesive could be used on medical implants, devices and surgical equipment where bacteria can contribute to chronic diseases, resist antibiotic treatment and thereby compromise the body's defense system. The prevention of aquatic biofouling on ships and bridges is one of the industrial applications. is. ### The BGU researchers who participated in the study from the Avram and Stella Goldstein-Goren Department of Biotechnology Engineering are Dr. Karina Goldberg, Prof. Noa Emuna, Prof. Dorit van Moppes, Prof. T. P. Vinod, Prof. Robert Marks, Prof. Ariel Kushmaro, and Prof. Shoshana Malis Arad. Profs. Marks and Kushmaro are members of BGU's Ilse Katz Institute for Nanoscale Science and Technology and the National Institute for Biotechnology in the Negev, and are also visiting researchers at the School of Materials Science and Engineering, Nanyang Technological University in Singapore. This work was supported by the Singapore National Research Foundation under the CREATE program: Nanomaterials for Energy and Water Management; a Levi Eshkol scholarship from the Israeli Ministry of Science and Technology, and by a Shimona Geresh award. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

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