Self-magnetism induced large magnetoresistance at room temperature region in graphene nanocrystallited carbon film

Wang, Chao; Diao, Dongfeng

doi:10.1016/j.carbon.2016.11.009

Cited by 17 publications

(8 citation statements)

References 53 publications

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“…This feature gives our device a huge advantage considering application, because it is much easier to build all electrodes just on the top surface of the film than on the bottom and top of few-atomic-layers of graphene. It also can be seen that the AMR changing ratio decreased as temperature increased from 300 to 400 K. This may be due to the increasing thermal fluctuation in the graphene nano-crystallites, leading to less ordered spin alignment and weaker intrinsic magnetism [22]. Therefore, the magnetic field has less influence in the transport of the carriers.…”

Section: Resultsmentioning

confidence: 99%

“…Nano-crystallited carbon film has gained much attention due to its excellent electrical [16,17], magnetic [18,19], and tribological [20,21] properties, especially its magnetoresistance (MR) at room temperature [22]. The novel electrical response of this film under external magnetic field shed light on a new-type of carbon-based magnetic sensing device.…”

Section: Introductionmentioning

confidence: 99%

“…The novel electrical response of this film under external magnetic field shed light on a new-type of carbon-based magnetic sensing device. In a recent study, it has been found that the RT-MR performance of graphene nano-crystallited film is originated from its self-magnetism enhancement and was highly related to the content of itinerant electrons in the film [22]. This phenomenon provided a new possibility to further improve the RT-MR properties by increasing the density of itinerant electrons.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Sensing Properties of PVD Carbon Films Containing Vertically Aligned Crystallites

Dai

Guo

Huang

et al. 2019

Sensors

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The demands for magnetic sensors are uprising due to the rapid development of smart equipments and internet of things. Exploring magnetic sensitive materials which are easily obtainable and of low cost thereby become of great significance. Carbon film with crystallized features was recently reported with room-temperature ferro-magnetism and magnetoresistance, owing to its spin–orbital interactions at the graphene edges and temperature-depending carrier transport properties. Such phenomena indicate that the film can serve as a novel magnetic sensitive material. In this study, carbon films with vertically aligned nano-crystallites were obtained by a plasma-assisted physical vapor deposition (PVD) method. Basic test circuits were built on the films, and the sensing properties were investigated in external magnetic fields with different intensities and relative angles to the films surface. The results showed that the carbon-based sensing devices were capable to work in the temperature region of 250–400 K. The minimum field intensity and angle change to which the device can respond were 1 mT and 2°. By substrate-introduced enhancement, the maximum changing-rate of the film resistance could reach to 1100%/T. This research pointed out a practical and simple way to build magnetic sensors with PVD carbon films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic Sensing Properties of PVD Carbon Films Containing Vertically Aligned Crystallites

Dai

Guo

Huang

et al. 2019

Sensors

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“…Edges and defects were considered to generate extra energy states near Fermi‐level and show different behaviors from bulk materials, such as serving as trapping centers in photovaltic processes . The GN edges significantly improves the performance of the GNEC film in terms of electromagnetics, surface friction, and photoelectricity …”

Section: Comparison Of Response Time (Rise Time) Of Our Device and Otmentioning

confidence: 99%

“…Edges and defects were considered to generate extra energy states near Fermi-level [14,15] and show different behaviors from bulk materials, such as serving as trapping centers in photovaltic processes. [15,16] The GN edges significantly improves the performance of the GNEC film in terms of electromagnetics, [17][18][19] surface friction, [20] and photoelectricity. [14,21] In this paper, we fabricated GNEC film/p-Si heterojunction photodiode by growing carbon films on p-silicon with low energy electron irradiation, and tested its photoelectric properties.…”

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confidence: 99%

Edge Effect on the Photodetection Ability of the Graphene Nanocrystallites Embedded Carbon Film Coated on p‐Silicon

Zhang

Peng

Lin

et al. 2019

Physica Rapid Research Ltrs

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A sensitive photodetector of graphene nanocrystallites embedded carbon (GNEC) film coated on p‐silicon has been proposed. Different from the conventional growth mode of graphene, GNEC film contains a large amount of vertically grown graphene nanocrystallites (GNs). Edges of GNs act as electron trapping centers, increasing the ability to capture electrons. Different types of films are prepared under various deposition biases (20, 40, 60, and 80 V), which have different density of edges (Nedge). Edge entrapment improves the photocurrent responsivity of 40 V film (high Nedge) to 0.401 A W−1, compared with 0.126 A W−1 of 20 V film (amorphous, no Nedge) and 0.194 A W−1 of 80 V film (low Nedge). A high specific detectivity of 1.34 × 1012 cm Hz1/2 W−1 is exhibited at zero bias. GNs maintain a charge transport channel, which makes it have a fast response time τrise = 260 ns.

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Robust low friction performance of graphene sheets embedded carbon films coated orthodontic stainless steel archwires

et al. 2021

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Reducing the friction force between the commercial archwire and bracket during the orthodontic treatment in general dental practice has attracted worldwide interest. An investigation on the friction and wear behaviors of the uncoated and carbon film coated stainless steel archwires running against stainless steel brackets was systematically conducted. The carbon films were prepared at substrate bias voltages from +5 to +50 V using an electron cyclotron resonance plasma sputtering system. With increasing substrate bias voltage, local microstructures of the carbon films evolved from amorphous carbon to graphene nanocrystallites. Both static and stable friction coefficients of the archwire-bracket contacts sliding in dry and wet (artificial saliva) conditions decreased with the deposition of carbon films on the archwires. Low friction coefficient of 0.12 was achieved in artificial saliva environment for the graphene sheets embedded carbon (GSEC) film coated archwire. Deterioration of the friction behavior of the GSEC film coated archwire occurred after immersion of the archwire in artificial saliva solution for different periods before friction test. However, moderate friction coefficient of less than 0.30 sustained after 30 days immersion periods. The low friction mechanism is clarified to be the formation of salivary adsorbed layer and graphene sheets containing tribofilm on the contact interfaces. The robust low friction and low wear performances of the GSEC film coated archwires make them good candidates for clinical orthodontic treatment applications.

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Self-magnetism induced large magnetoresistance at room temperature region in graphene nanocrystallited carbon film

Cited by 17 publications

References 53 publications

Magnetic Sensing Properties of PVD Carbon Films Containing Vertically Aligned Crystallites

Magnetic Sensing Properties of PVD Carbon Films Containing Vertically Aligned Crystallites

Edge Effect on the Photodetection Ability of the Graphene Nanocrystallites Embedded Carbon Film Coated on p‐Silicon

Robust low friction performance of graphene sheets embedded carbon films coated orthodontic stainless steel archwires

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