Single layer graphene Hall sensors for scanning Hall probe microscopy (SHPM) in 3–300K temperature range

2014 ◽  
Vol 308 ◽  
pp. 414-418 ◽  
Author(s):  
S. Sonusen ◽  
O. Karci ◽  
M. Dede ◽  
S. Aksoy ◽  
A. Oral
Keyword(s):  
Single Layer ◽  
Single Layer Graphene ◽  
Hall Probe ◽  
Probe Microscopy ◽  
Temperature Range ◽  
Layer Graphene ◽  
Hall Sensors ◽  
Scanning Hall Probe Microscopy

scholarly journals DEPENDENCE OF MAXIMAL SENSITIVITY OF THE MAGNETIC FIELD HALL SENSORS BASED ON GRAPHENE ON TEMPERATURE

2021 ◽  
Vol 18 (3) ◽  
pp. 29-37
Author(s):  
І. Bolshakova ◽  
М. Strikha ◽  
Ya. Kost ◽  
F. Shurygin ◽  
Yu. Mykhashchuk ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Thermally Induced ◽  
Temperature Range ◽  
Layer Graphene ◽  
Maximal Sensitivity ◽  
Hall Sensors ◽  
The Magnetic Field

A theory of graphene-based magnetic field Hall sensors sensitivity dependence on temperature is summarized. The existence of low-temperature range with sensitivity, almost independent on temperature, is predicted; at higher temperatures, when thermally-induced carrier concentration in graphene prevails, the sensitivity decreases with temperature. The experimental studies of the temperature dependence of magnetic sensitivity of Hall sensors on single layer graphene base were carried in temperature range from 300 °K to 430 °K. The values of sensitivity, obtained for room temperatures ~ 230 V·А‑1·Т‑1 exceed essentially the maximum sensitivity of the traditional Hall sensors on silicon base ~ 100  V·А‑1·Т‑1.

scholarly journals 50 nm Hall Sensors for Room Temperature Scanning Hall Probe Microscopy

2004 ◽  
Vol 43 (2) ◽  
pp. 777-778 ◽  
Author(s):  
Adarsh Sandhu ◽  
Kouichi Kurosawa ◽  
Munir Dede ◽  
Ahmet Oral
Keyword(s):  
Room Temperature ◽  
Hall Probe ◽  
Probe Microscopy ◽  
Temperature Scanning ◽  
Hall Sensors ◽  
Scanning Hall Probe Microscopy

scholarly journals Granular Hall Sensors for Scanning Probe Microscopy

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 348
Author(s):  
Roland Sachser ◽  
Johanna Hütner ◽  
Christian H. Schwalb ◽  
Michael Huth
Keyword(s):  
Thin Films ◽  
Spin Valve ◽  
Magnetic Thin Films ◽  
Stray Field ◽  
Hall Probe ◽  
Direct Write ◽  
Probe Microscopy ◽  
Custom Made ◽  
Hall Sensors ◽  
Scanning Hall Probe Microscopy

Scanning Hall probe microscopy is attractive for minimally invasive characterization of magnetic thin films and nanostructures by measurement of the emanating magnetic stray field. Established sensor probes operating at room temperature employ highly miniaturized spin-valve elements or semimetals, such as Bi. As the sensor layer structures are fabricated by patterning of planar thin films, their adaption to custom-made sensor probe geometries is highly challenging or impossible. Here we show how nanogranular ferromagnetic Hall devices fabricated by the direct-write method of focused electron beam induced deposition (FEBID) can be tailor-made for any given probe geometry. Furthermore, we demonstrate how the magnetic stray field sensitivity can be optimized in situ directly after direct-write nanofabrication of the sensor element. First proof-of-principle results on the use of this novel scanning Hall sensor are shown.

Comparative study of electron transfer on various graphene-metallic contacts

2019 ◽  
Vol 33 (31) ◽  
pp. 1950384
Author(s):  
Di Lu ◽  
Yu-E Yang ◽  
Weichun Zhang ◽  
Caixia Wang ◽  
Jining Fang ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Single Layer ◽  
Annealing Treatment ◽  
Single Layer Graphene ◽  
Strain Effect ◽  
Graphene Surface ◽  
Layer Graphene ◽  
Metallic Contacts ◽  
Nonuniform Strain ◽  
Main Factor

We have investigated Raman spectra of the G and 2D lines of a single-layer graphene (SLG) with metallic contacts. The shift of the G and 2D lines is correlated to two different factors. Before performing annealing treatment or annealing under low temperature, the electron transfer on graphene surface is dominated by nonuniform strain effect. As the annealing treatment is enhanced, however, a suitable annealing treatment can eliminate the nonuniform strain effect where the relative work function (WF) between graphene and metal becomes a main factor to determine electronic transfer. Moreover, it is confirmed that the optimized annealing treatment can also decrease effectively the structural defect and induced disorder in graphene due to metallic contacts.

Hybrid dye sensitized solar cell based on single layer graphene quantum dots

2020 ◽  
Vol 175 ◽  
pp. 108118 ◽  
Author(s):  
Farhad Jahantigh ◽  
S.M. Bagher Ghorashi ◽  
Amir Bayat
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Graphene Quantum Dots ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized ◽  
Layer Graphene

scholarly journals Millisecond lattice gasification for high-density CO2- and O2-sieving nanopores in single-layer graphene

2021 ◽  
Vol 7 (9) ◽  
pp. eabf0116
Author(s):  
Shiqi Huang ◽  
Shaoxian Li ◽  
Luis Francisco Villalobos ◽  
Mostapha Dakhchoune ◽  
Marina Micari ◽  
...  
Keyword(s):  
Single Layer ◽  
High Density ◽  
Single Layer Graphene ◽  
Pore Density ◽  
Vacancy Defects ◽  
Carbon Gasification ◽  
Layer Graphene ◽  
Gas Molecules ◽  
Good Agreement

Etching single-layer graphene to incorporate a high pore density with sub-angstrom precision in molecular differentiation is critical to realize the promising high-flux separation of similar-sized gas molecules, e.g., CO2 from N2. However, rapid etching kinetics needed to achieve the high pore density is challenging to control for such precision. Here, we report a millisecond carbon gasification chemistry incorporating high density (>1012 cm−2) of functional oxygen clusters that then evolve in CO2-sieving vacancy defects under controlled and predictable gasification conditions. A statistical distribution of nanopore lattice isomers is observed, in good agreement with the theoretical solution to the isomer cataloging problem. The gasification technique is scalable, and a centimeter-scale membrane is demonstrated. Last, molecular cutoff could be adjusted by 0.1 Å by in situ expansion of the vacancy defects in an O2 atmosphere. Large CO2 and O2 permeances (>10,000 and 1000 GPU, respectively) are demonstrated accompanying attractive CO2/N2 and O2/N2 selectivities.

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