Search results
Search for "signal-to-noise ratio" in Full Text gives 161 result(s) in Beilstein Journal of Nanotechnology.
Distinction of nucleobases – a tip-enhanced Raman approach
Beilstein J. Nanotechnol. 2011, 2, 628–637, doi:10.3762/bjnano.2.66
- found, and consequently a sequence-specific detection is only restricted by the lateral resolution and ultimately by the signal-to-noise ratio of the spectra recorded at subsequent positions. Conclusion Our results present several important steps towards a direct and label-free sequencing of RNA/DNA
Femtosecond time-resolved photodissociation dynamics of methyl halide molecules on ultrathin gold films
Beilstein J. Nanotechnol. 2011, 2, 618–627, doi:10.3762/bjnano.2.65
- single transients were averaged to improve the signal-to-noise ratio. The transient was obtained with 2 mW/cm² pump (266 nm) and 200 mW/cm² probe (333 nm) laser power. Intensity of the CH3+ signal as a function of (a) pump power and (b) probe power. Both measurements (a) and (b) were performed for a pump
Room temperature excitation spectroscopy of single quantum dots
Beilstein J. Nanotechnol. 2011, 2, 516–524, doi:10.3762/bjnano.2.56
- devices. The primary challenge has been the intrinsic difficulty in measuring the absorption of a single emitter at room temperature due to the extremely low signal to noise ratio. Although recent reports have demonstrated the detection of single molecule absorbance [25][26][27], a complete single
Tip-enhanced Raman spectroscopic imaging of patterned thiol monolayers
Beilstein J. Nanotechnol. 2011, 2, 509–515, doi:10.3762/bjnano.2.55
- enhancement can in principle be reached. An attempt was made to visualize the distribution of molecules using SERS, but this did not yield satisfactory results. However, the large signal-to-noise ratio in every pixel of a TERS image allows one to obtain enough information to distinguish a full monolayer from
- each TERS map, laser power and exposure time per spectrum were adapted according to the enhancement of the tip and the activity of the analyte. The laser power used ranged between 0.1–2.0 mW and collection times of 0.1–2.0 s per spectrum were chosen to yield a sufficient signal-to-noise ratio for the
Simulation of bonding effects in HRTEM images of light element materials
Beilstein J. Nanotechnol. 2011, 2, 394–404, doi:10.3762/bjnano.2.45
- remains stable enough under the electron beam to obtain a sufficient high signal to noise ratio, this might be achievable by applying higher defocus (see second row in Figure 10) or a phase plate (see third row in Figure 10). Conclusion We presented a practical method to include chemical bonding in the
Effect of large mechanical stress on the magnetic properties of embedded Fe nanoparticles
Beilstein J. Nanotechnol. 2011, 2, 268–275, doi:10.3762/bjnano.2.31
- films, each bit comprises a large number of magnetic grains, which are coupled by dipolar interactions and, to some extent, by inter granular exchange coupling. The necessity for incorporation of many grains in each bit arises from the requirement for a sufficiently large signal-to-noise ratio. A
Extended X-ray absorption fine structure of bimetallic nanoparticles
Beilstein J. Nanotechnol. 2011, 2, 237–251, doi:10.3762/bjnano.2.28
- 2. In this case, the data have to be multiplied by a window function W since for low values of k (XANES regime) the resonant absorption dominates the scattering effects, and for high values of k the signal-to-noise ratio becomes too small. The data are shown only in the region of non-vanishing
Single-pass Kelvin force microscopy and dC/dZ measurements in the intermittent contact: applications to polymer materials
Beilstein J. Nanotechnol. 2011, 2, 15–27, doi:10.3762/bjnano.2.2
- nanotubes probes (generously provided by Carbon Design Innovations). The probes with small tip apex and tips with high aspect ratio provide higher spatial resolution of surface potential images whereas the probes with thicker tips have a better signal-to-noise ratio of the surface potential. The majority of
- images obtained in both regimes. The signal-to-noise ratio of the surface potential pattern is higher in the intermittent contact operation due to the larger dC/dZ amplitude in immediate vicinity of the sample. A higher spatial resolution of the surface potential image obtained in the intermittent
Defects in oxide surfaces studied by atomic force and scanning tunneling microscopy
Beilstein J. Nanotechnol. 2011, 2, 1–14, doi:10.3762/bjnano.2.1
- oscillation amplitude of the tuning fork. The signal is so small that a low-temperature amplifier has to be placed nearby to improve the signal-to-noise ratio. In NC-AFM, the shift of the tuning fork resonance frequency Δf is used as a feedback signal to scan with constant Δf. The tip is electrically
Magnetic nanoparticles for biomedical NMR-based diagnostics
Beilstein J. Nanotechnol. 2010, 1, 142–154, doi:10.3762/bjnano.1.17
- measurements, and each microcoil held 5–10 μl of sample. In the second-generation μNMR, we changed our design to solenoidal coils [15][16], as such geometry provides higher signal-to-noise ratio (SNR) by producing more homogeneous radio-frequency magnetic fields for sample excitation. The SNR could be further
- factor, better signal-to-noise ratio, and reduced sample volume requirement to ~1 μL. (c) The latest 0.1 kg “palm” DMR system is 20× lighter and 30× smaller than previous generations. To achieve this significant size reduction, a small 0.56 T magnet was used. To compensate for the signal reduction from
Preparation and characterization of supported magnetic nanoparticles prepared by reverse micelles
Beilstein J. Nanotechnol. 2010, 1, 24–47, doi:10.3762/bjnano.1.5
- for the XPS spectra. For example, to arrive at a reasonable signal-to-noise ratio for the Co-2p peaks, a data acquisition time of 12 h is required. Even under UHV conditions such a long exposure of a sample surface to X-rays results in the built-up of a small amount of carbon contamination, which, by
Other Beilstein-Institut Open Science Activities
