Double-Layered Silica-Engineered Fluorescent Nanodiamonds for Catalytic Generation and Quantum Sensing of Active Radicals

• URL: http://arxiv.org/abs/2512.21934v1
• Date: Fri, 26 Dec 2025 09:17:12 GMT
• Title: Double-Layered Silica-Engineered Fluorescent Nanodiamonds for Catalytic Generation and Quantum Sensing of Active Radicals
• Abstract summary: We report a practical quantum-sensing platform for the controlled production and real-time monitoring of ultra-short-lived reactive free radicals.<n>The radical production is monitored in real time and in situ through spin-dependent T1 relaxometry of the NV centers.<n>This study extends the technical application of nanodiamonds from relaxation sensing to the controlled synthesis of reactive free radicals.
• Score: 9.51161946451283
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Fluorescent nanodiamonds (FNDs) hosting nitrogen-vacancy (NV) centers have attracted considerable attention for quantum sensing applications, particularly owing to notable advancements achieved in the field of weak magnetic signal detection in recent years. Here, we report a practical quantum-sensing platform for the controlled production and real-time monitoring of ultra-short-lived reactive free radicals using a double-layered silica modification strategy. An inner dense silica layer preserves the intrinsic properties of NV centers, while an outer porous silica layer facilitates efficient adsorption and stabilization of hydroxyl radicals and their precursor reactants. By doping this mesoporous shell with gadolinium (III) catalysts, we achieve sustained, light-free generation of hydroxyl radicals via catalytic water splitting, eliminating reliance on external precursors. The mechanism underlying this efficient radical generation is discussed in detail. The radical production is monitored in real time and in situ through spin-dependent T1 relaxometry of the NV centers, demonstrating stable and tunable radical fluxes, with concentration tunable across a continuous range from approximately 100 mM to molar levels by adjusting the catalyst condition. This study extends the technical application of nanodiamonds from relaxation sensing to the controlled synthesis of reactive free radicals, thereby providing robust experimental evidence to support the advancement of quantum sensing systems in intelligent manufacturing.

Related papers

• Towards Application of Nanodiamonds for in-situ Monitoring of Radicals in Liquid Phase Chemical Reactions [0.0]
  In this setting, we demonstrate the successful in-situ detection of the nitroxide radical 2,2,6,6-Tetramethylpiperidinyloxyl (TEMPO) using NV center-based T$_1$ relaxometry.<n>A significant concentration-dependent shortening of the relaxation time was observed, from $197:s pm 21:s$ without radical to $66:s pm 30:s$ at a concentration of 1 M TEMPO.
  arXiv  Detail & Related papers  (2026-04-21T13:08:56Z)
• Control of molecular rotation in helium nanodroplets with an optical centrifuge [39.146761527401424]
  We experimentally demonstrate that the rotation of molecules embedded in helium nanodroplets can be controlled with an optical centrifuge.<n>The ability to control and monitor the rotational frequencies of molecular droplets inside the superfluid medium may shed new light on superfluidity.
  arXiv  Detail & Related papers  (2025-09-03T00:48:15Z)
• Non-perturbative exciton transfer rate analysis of the Fenna-Matthews-Olson photosynthetic complex under reduced and oxidised conditions [39.58317527488534]
  Two-dimensional optical spectroscopy experiments have shown that exciton transfer pathways in the Fenna-Matthews-Olson (FMO) photosynthetic complex differ drastically under reduced and oxidised conditions.<n>Redfield theory was used to link the experimental observations to altered exciton transfer rates due to oxidative onsite energy shifts.<n>We present non-perturbative estimations of transfer rates that yield a modified physical picture.
  arXiv  Detail & Related papers  (2024-12-18T16:19:19Z)
• Crystallinity in Niobium oxides: A pathway to mitigate Two-Level System Defects in Niobium 3D Resonator for quantum applications [0.0]
  Two-level-system (TLS) defects are a major source of decoherence in superconducting quantum circuits. We demonstrate the reduction of two-level system losses in three-dimensional superconducting radio frequency (SRF) niobium resonators by a 10-hour high vacuum heat treatment at 650degC.
  arXiv  Detail & Related papers  (2024-10-09T12:02:32Z)
• In-situ-tunable spin-spin interactions in a Penning trap with in-bore optomechanics [41.94295877935867]
  We present an optomechanical system for in-situ tuning of the coherent spin-motion and spin-spin interaction strength. We characterize the system using measurements of the induced mean-field spin precession. These experiments show approximately a $times2$ variation in the ratio of the coherent to incoherent interaction strength.
  arXiv  Detail & Related papers  (2024-01-31T11:00:39Z)
• Quantum-grade nanodiamonds for ultrabright spin detection in live cells [0.49824235871245376]
  Optically accessible spin-active nanomaterials are promising as quantum nanosensors for probing biological samples. We demonstrate ultrabright fluorescent nanodiamonds (NDs) containing 0.6-1.3-ppm nitrogen-vacancy (NV) centers by spin-environment engineering.
  arXiv  Detail & Related papers  (2023-12-29T13:54:28Z)
• Nanodiamond emulsions for enhanced quantum sensing and click-chemistry conjugation [0.0]
  We report a simple and general method to coat nanodiamonds with a thin emulsion layer that preserves their quantum features. We study the effect of the emulsion layer on the NV center's spin lifetime, and we quantify the nanodiamonds' chemical sensitivity to paramagnetic ions.
  arXiv  Detail & Related papers  (2023-11-28T05:28:40Z)
• Magic Angle Spinning Effects on Longitudinal NMR Relaxation: 15N in L-Histidine [0.0]
  Longitudinal relaxation is a mechanism that returns longitudinal nuclear magnetization to its thermal equilibrium by incoherent processes. This work demonstrates the effect of magic angle spinning rate on the longitudinal relaxation rate constant in two model compounds.
  arXiv  Detail & Related papers  (2023-09-20T13:53:57Z)
• Sensing of magnetic field effects in radical-pair reactions using a quantum sensor [50.591267188664666]
  Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades. We employ elaborate and realistic models of radical-pairs, considering its coupling to the local spin environment and the sensor. For two model systems, we derive signals of MFE detectable even in the weak coupling regime between radical-pair and NV quantum sensor.
  arXiv  Detail & Related papers  (2022-09-28T12:56:15Z)
• Single Nitrogen-Vacancy-NMR of Amine-Functionalized Diamond Surfaces [0.5437050212139087]
  Nuclear magnetic resonance (NMR) imaging with shallow nitrogen-vacancy (NV) centers in diamond offers an exciting route toward sensitive and localized chemical characterization at the nanoscale. We demonstrate a diamond surface preparation for mixed nitrogen- and oxygen-termination that simultaneously improves NV center coherence times for emitters 10-nm-deep.
  arXiv  Detail & Related papers  (2022-02-08T16:17:22Z)
• Rapidly enhanced spin polarization injection in an optically pumped spin ratchet [49.1301457567913]
  We report on a strategy to boost the spin injection rate by exploiting electrons that can be rapidly polarized. We demonstrate this in a model system of Nitrogen Vacancy center electrons injecting polarization into a bath of 13C nuclei in diamond. Through a spin-ratchet polarization transfer mechanism, we show boosts in spin injection rates by over two orders of magnitude.
  arXiv  Detail & Related papers  (2021-12-14T08:23:10Z)
• TOF-SIMS Analysis of Decoherence Sources in Nb Superconducting Resonators [48.7576911714538]
  Superconducting qubits have emerged as a potentially foundational platform technology. Material quality and interfacial structures continue to curb device performance. Two-level system defects in the thin film and adjacent regions introduce noise and dissipate electromagnetic energy.
  arXiv  Detail & Related papers  (2021-08-30T22:22:47Z)
• Discovery of Nb hydride precipitates in superconducting qubits [37.69303106863453]
  We report the first evidence of the formation of niobium hydrides within niobium films on silicon in superconducting qubits fabricated at Rigetti Computing. High-resolution transmission electron microscopy (HRTEM) analyses are performed at room and cryogenic temperatures (106 K) on superconducting qubit niobium film areas. Our findings highlight a new previously unknown source of decoherence in superconducting qubits, contributing to both quasi and two-level system (TLS) losses.
  arXiv  Detail & Related papers  (2021-08-23T20:01:38Z)
• Room temperature single-photon emitters in silicon nitride [97.75917079876487]
  We report on the first-time observation of room-temperature single-photon emitters in silicon nitride (SiN) films grown on silicon dioxide substrates. As SiN has recently emerged as one of the most promising materials for integrated quantum photonics, the proposed platform is suitable for scalable fabrication of quantum on-chip devices.
  arXiv  Detail & Related papers  (2021-04-16T14:20:11Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)
• The limit of spin lifetime in solid-state electronic spins [77.34726150561087]
  We provide a complete first-principles picture of spin relaxation that includes up to two-phonon processes. We study a vanadium-based molecular qubit and reveal that the spin lifetime at high temperature is limited by Raman processes.
  arXiv  Detail & Related papers  (2020-04-08T14:27:36Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.