Magnetoresistance Behavior of Cryogenic Temperature Sensors Based on Single-Walled Carbon Nanotubes
| Autor: | Bogdan Florian Monea, Stefan Ionut Spiridon, Alina Niculescu, Eusebiu Ilarian Ionete |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Condensed matter physics Magnetoresistance 010401 analytical chemistry Carbon nanotube 01 natural sciences Temperature measurement 0104 chemical sciences Physical property law.invention Magnetic field Condensed Matter::Materials Science Electrical resistance and conductance law Electrical and Electronic Engineering Chirality (chemistry) Instrumentation Quantum |
| Zdroj: | IEEE Sensors Journal. 21:2767-2774 |
| ISSN: | 2379-9153 1530-437X |
| Popis: | We report on the experimental investigation of the magnetoresistance behavior of cryogenic temperature sensors based on single-walled carbon nanotubes (SWCNTs) as a function of temperature and magnetic flux density; one sensor was based on layers/networks of unsorted SWCNT of various chiralities, and one on SWCNTs layers of (7,6) chirality. SWCNT-based sensors were fabricated according to a straightforward method, and the electrical properties were measured from room temperature down to 2 K using a Quantum Design Physical Property Measurement System (PPMS). The two sensors present different magneto-transport behavior, with the magnetoresistance dependence on the magnetic field being a sum of two terms with positive and negative contributions respectively. The expression for magnetoresistance is derived together with its experimentally determined coefficients. For both sensors, the electrical resistance dependence on temperature below the 80 K mark is explained by Mott’s law of variable-range hopping. The experimentally obtained hopping dimension ${d}$ values of 2.67 for the system comprised of purified (7,6) chirality SWCNTs and 2.97 for the system comprised of unsorted SWCNTs are in good agreement with the theory. As a second step, the magnetic field was kept constant and at different values, while the temperature was scanned over the investigated domain. |
| Databáze: | OpenAIRE |
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