Abstract: The present invention relates, in general terms, to magnetoresistance sensors and methods of fabrication thereof. The magnetoresistance sensor comprises a continuous graphene layer disposed on a corrugated and/or stepped surface of a substrate. At least two conductive elements are in contact with the graphene layer. The graphene layer substantially conforms to the corrugated and/or stepped surface of the substrate.

Abstract: An exemplary integrated nuclear quadrupole resonance-based detection system comprises a front-end device having a hand-held form factor, wherein the front-end device is configured to scan a sample in or near a sample coil using inbuild electronics and acquire a nuclear quadrupole resonance measurement. The system further includes a swappable sample coil that is attached to an opening at a face of the front-end device and is tuned to a resonant frequency of the sample; and a swappable impedance matching network that is attached to the opening at the face of the front-end device and is configured to tune the resonant frequency of the sample coil. The inbuild electronics comprises a wireless transfer module that is configured to communicate the acquired nuclear quadrupole resonance measurement with a back-end device of the integrated nuclear quadrupole resonance-based detection system. Other systems and methods are also provided.

Abstract: An example multi-channel magnetic resonance (MR) system is described. The system includes a plurality of radio frequency (RF) coils and a plurality of spectrometer transceiver channels. Each of the channels including a spectrometer coupled a respective set of the RF coils. The spectrometer is configured to transmit RF signals to excite respective RF coils and to receive MR sensor signals from the excited respective RF coils responsive to excitation thereof. The spectrometer is configured to perform MR spectrometry to provide MR measurement data based on the received MR sensor signals for the respective channel. A synchronization module is coupled to the spectrometer of the respective channel. The synchronization module is configured to synchronize the spectrometer of the respective channel with spectrometers in other channels via a communication link.

Abstract: An exemplary integrated nuclear quadrupole resonance-based detection system comprises a front-end device having a hand-held form factor, wherein the front-end device is configured to scan a sample in or near a sample coil using inbuild electronics and acquire a nuclear quadrupole resonance measurement. The system further includes a swappable sample coil that is attached to an opening at a face of the front-end device and is tuned to a resonant frequency of the sample; and a swappable impedance matching network that is attached to the opening at the face of the front-end device and is configured to tune the resonant frequency of the sample coil. The inbuild electronics comprises a wireless transfer module that is configured to communicate the acquired nuclear quadrupole resonance measurement with a back-end device of the integrated nuclear quadrupole resonance-based detection system. Other systems and methods are also provided.

Abstract: An example multi-channel magnetic resonance (MR) system is described. The system includes a plurality of radio frequency (RF) coils and a plurality of spectrometer transceiver channels. Each of the channels including a spectrometer coupled a respective set of the RF coils. The spectrometer is configured to transmit RF signals to excite respective RF coils and to receive MR sensor signals from the excited respective RF coils responsive to excitation thereof. The spectrometer is configured to perform MR spectrometry to provide MR measurement data based on the received MR sensor signals for the respective channel. A synchronization module is coupled to the spectrometer of the respective channel. The synchronization module is configured to synchronize the spectrometer of the respective channel with spectrometers in other channels via a communication link.

Abstract: An article includes a layer of graphene having a first work function; and a metal oxide film disposed on the layer of graphene, the metal oxide film having a second work function greater than the first work function. Electrons are transferred from the layer of graphene to the metal oxide film, forming a hole accumulation layer in the layer of graphene.

Abstract: An article includes a layer of graphene having a first work function; and a metal oxide film disposed on the layer of graphene, the metal oxide film having a second work function greater than the first work function. Electrons are transferred from the layer of graphene to the metal oxide film, forming a hole accumulation layer in the layer of graphene.