High-Resolution Nanoscale Solid-State Nuclear Magnetic Resonance Spectroscopy

Abstract

We present a new method for high-resolution nanoscale magnetic resonance imaging (nano-MRI) that combines the high spin sensitivity of nanowire-based magnetic resonance detection with high-spectralresolution nuclear magnetic resonance (NMR) spectroscopy. Using a new method that incorporates average Hamiltonian theory into optimal control pulse engineering, we demonstrate NMR pulses that achieve high-fidelity quantum control of nuclear spins in nanometer-scale ensembles. We apply this capability to perform dynamical decoupling experiments that achieve a factor of 500 reduction of the proton-spin resonance linewidth in a ð50-nmÞ 3 volume of polystyrene. We make use of the enhanced spin coherence times to perform Fourier-transform imaging of proton spins with a one-dimensional slice thickness below 2 nm.

Towards the digitalisation of porous energy materials: evolution of digital approaches for microstructural design

“…[67][68][69] Recently, several groups have achieved highresolution nano-scale NMR (spatial resolution o10 nm). [70][71][72] However, these techniques require special facilities, such as the use of nitrogen-vacancy centre on the tip of a scanning probe microscope. 78 MRI has also been employed to determine ionic transport in supercapacitors but no electrode microstructures have been imaged.…”

Engineering effective Hamiltonians

“…Some of the authors of this manuscript have successfully employed the methods presented for nanoscale magnetic resonance imaging experiments [50]. These experiments posed a very challenging control setting-we were dealing with an ensemble of strongly dipolar coupled proton spins that experienced a vast Rabi (control) field strength ( a t | ( )|) variation of a t 0.9 MHz 1.7 MHz   | ( )| , while the phase coherence time (T 2 ) of the coupled spins was 11 μs.…”

“…In this manuscript, we have also demonstrated the use of this method in a variety of scenarios, including the successful application in nanoscale magnetic resonance experiments [50]. We note that the examples presented in this manuscript should not be understood as comprehensive; in order to keep our treatment illustrative and concise, we did not present control searches involving Dyson terms higher than first order.…”

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

“…Other approaches not based on NV centers are evolving at the same pace as methods based on NV centers. For example, a new method for high-resolution nano-MRI coupling high spin sensitivity of nanowire-based MR detection with high-spectral-resolution NMR spectroscopy is presented in [13]. In terms of future commercial products that permit nano-MRI to be undertaken at hospitals and for medical research, it will inevitably be required that they be produced in a way that secures the best trade-off between cost and performance.…”