| 1. |
- Ferrari, A. C., et al.
(författare)
-
Science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems
- 2015
-
Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3372 .- 2040-3364. ; 7:11, s. 4598-4810
-
Tidskriftsartikel (refereegranskat)abstract
- We present the science and technology roadmap for graphene, related two-dimensional crystals, and hybrid systems, targeting an evolution in technology, that might lead to impacts and benefits reaching into most areas of society. This roadmap was developed within the framework of the European Graphene Flagship and outlines the main targets and research areas as best understood at the start of this ambitious project. We provide an overview of the key aspects of graphene and related materials (GRMs), ranging from fundamental research challenges to a variety of applications in a large number of sectors, highlighting the steps necessary to take GRMs from a state of raw potential to a point where they might revolutionize multiple industries. We also define an extensive list of acronyms in an effort to standardize the nomenclature in this emerging field.
|
|
| 2. |
- Hakkinen, P., et al.
(författare)
-
Charge Sensitivity Enhancement via Mechanical Oscillation in Suspended Carbon Nanotube Devices
- 2015
-
Ingår i: Nano Letters. - : American Chemical Society (ACS). - 1530-6992 .- 1530-6984. ; 15:3, s. 1667-1672
-
Tidskriftsartikel (refereegranskat)abstract
- Single electron transistors (SETs) fabricated from single-walled carbon nanotubes (SWNTs) can be operated as highly sensitive charge detectors reaching sensitivity levels comparable to metallic radio frequency SETs (rf-SETs). Here, we demonstrate how the charge sensitivity of the device can be improved by using the mechanical oscillations of a single-walled carbon nanotube quantum dot. To optimize the charge sensitivity dQ, we drive the mechanical resonator far into the nonlinear regime and bias it to an operating point where the mechanical third order nonlinearity is canceled out. This way we enhance dQ, from 6 mu e/(Hz)(1/2) for the static case to 0.97 mu e/(Hz)(1/2) at a probe frequency of similar to 1.3 kHz.
|
|
| 3. |
- Roschier, L, et al.
(författare)
-
Noise performance of the radio-frequency single-electron transistor
- 2004
-
Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 95:3, s. 1274-1286
-
Tidskriftsartikel (refereegranskat)abstract
- Measurements were performed on aluminum and multiwalled carbon nanotube radio-frequency single-electron transistors (RF-SETs) and analyzed the results carefully. A detailed noise model based on scattering matrix and noise wave formalisms was developed. The signal-to-noise ratios obtained from the model agree well with the measured charge sensitivities. It was found that, in the setup, the first stage HEMT amplifier was the most inadequate component contributing nearly all of the charge noise.
|
|
| 4. |
- Tomi, M., et al.
(författare)
-
Buckled diamond-like carbon nanomechanical resonators
- 2015
-
Ingår i: Nanoscale. - : Royal Society of Chemistry (RSC). - 2040-3372 .- 2040-3364. ; 7:35, s. 14747-14751
-
Tidskriftsartikel (refereegranskat)abstract
- We have developed capacitively-transduced nanomechanical resonators using sp(2)-rich diamond-like carbon (DLC) thin films as conducting membranes. The electrically conducting DLC films were grown by physical vapor deposition at a temperature of 500 degrees C. Characterizing the resonant response, we find a larger than expected frequency tuning that we attribute to the membrane being buckled upwards, away from the bottom electrode. The possibility of using buckled resonators to increase frequency tuning can be of advantage in rf applications such as tunable GHz filters and voltage-controlled oscillators.
|
|
| 5. |
|
|
| 6. |
|
|
| 7. |
|
|
| 8. |
- Miettinen, PJ, et al.
(författare)
-
Downregulation of EGF receptor signaling in pancreatic islets causes diabetes due to impaired postnatal beta-cell growth
- 2006
-
Ingår i: Diabetes. - : American Diabetes Association. - 0012-1797 .- 1939-327X. ; 55:12, s. 3299-3308
-
Tidskriftsartikel (refereegranskat)abstract
- Epidermal growth factor receptor (EGF-R) signaling is essential for proper fetal development and growth of pancreatic islets, and there is also evidence for its involvement in β-cell signal transduction in the adult. To study the functional roles of EGF-R in β-cell physiology in postnatal life, we have generated transgenic mice that carry a mutated EGF-R under the pancreatic duodenal homeobox-1 promoter (E1-DN mice). The transgene was expressed in islet β- and δ-cells but not in α-cells, as expected, and it resulted in an ∼40% reduction in pancreatic EGF-R, extracellular signal–related kinase, and Akt phosphorylation. Homozygous E1-DN mice were overtly diabetic after the age of 2 weeks. The hyperglycemia was more pronounced in male than in female mice. The relative β-cell surface area of E1-DN mice was highly reduced at the age of 2 months, while α-cell surface area was not changed. This defect was essentially postnatal, since the differences in β-cell area of newborn mice were much smaller. An apparent explanation for this is impaired postnatal β-cell proliferation; the normal surge of β-cell proliferation during 2 weeks after birth was totally abolished in the transgenic mice. Heterozygous E1-DN mice were glucose intolerant in intraperitoneal glucose tests. This was associated with a reduced insulin response. However, downregulation of EGF-R signaling had no influence on the insulinotropic effect of glucagon-like peptide-1 analog exendin-4. In summary, our results show that even a modest attenuation of EGF-R signaling leads to a severe defect in postnatal growth of the β-cells, which leads to the development of diabetes.
|
|
| 9. |
- Tokarz, Michal, 1976, et al.
(författare)
-
Electrophoretic transport of latex particles in lipid nanotubes
- 2007
-
Ingår i: Langmuir. - : American Chemical Society (ACS). - 1520-5827 .- 0743-7463. ; 23:14, s. 7652-7658
-
Tidskriftsartikel (refereegranskat)abstract
- Lipid vesicles can be connected by membrane nanotubes to build networks with promising bioanalytical properties. Here we characterize electrophoretic transport in such membrane tubes, with a particular eye to how their soft-material nature influences the intratube migration. In the absence of field, the tube radius is 110 +/- 26 nm, and it remains in this range during electrophoresis even though the applied electric field causes a slight decrease in the tube radius (similar to 6-11%). The electrophoretic velocity of the membrane wall (labeled with quantum dots) varies linearly with the field strength. Intratube migration is studied with latex spheres of radii 15, 50, 100, and 250 nm. The largest particle size does not enter the tube at fields strengths lower than 1250 V/m because the energy cost for expanding the tube around the particles is too high. The smaller particles migrate with essentially the same velocity as the membrane at low fields. Above 250 V/cm, the 15 nm particles exhibit an upward deviation from linear behavior and in fact migrate faster than in free solution whereas the 100 nm particles deviate downward. We propose that these nonlinear effects arise because of lipid adsorption to the particles (dominating for 15 nm particles) and a pistonlike compression of the solvent in front of the particles (dominating for 100 nm). As expected from such complexities, existing theories for a sphere migrating in a rigid-wall cylinder cannot explain our velocity results in lipid nanotubes.
|
|
