Spin defects in semiconductors are widely investigated for various
applications in quantum sensing. Conventional host materials such as diamond
and hexagonal boron nitride (hBN) provide bulk or low-dimensional platforms for
optically addressable spin systems, but often lack the structural properties
needed for chemical sensing. Ici, we introduce a new class of quantum sensors
based on naturally occurring spin defects in boron nitride nanotubes (BNNTs),
which combine high surface area with omnidirectional spin control, key features
for enhanced sensing performance. First, we present strong evidence that these
defects are carbon-related, akin to recently identified centers in hBN, et
demonstrate coherent spin control over ensembles embedded within dense,
microscale BNNTs networks. Using dynamical decoupling, we enhance spin
coherence times by a factor exceeding 300x and implement high-resolution
detection of radiofrequency signals. By integrating the BNNT mesh sensor into a
microfluidic platform we demonstrate chemical sensing of paramagnetic ions in
solution, with detectable concentrations reaching levels nearly 1000 times
lower than previously demonstrated using comparable hBN-based systems. Ce
highly porous and flexible architecture positions BNNTs as a powerful new host
material for quantum sensing.

Cet article explore les excursions dans le temps et leurs implications.

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