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Showing 1 to 13 of 13 for “"niobium nitride"”.
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Reactive DC magnetron sputtering of ultrathin superconducting niobium nitride films
… was used to deposit few-nanometer-thick films of niobium nitride for fabrication of superconducting devices. Over 1000 samples were deposited on a variety of substrates, under various chamber conditions. Sheet resistance, thickness and superconducting critical temperature were measured for a large …
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Investigation of Thin Film Supercurrent and Photodetection in Wide Niobium Nitride Wires
… wide single photon detectors using nitrogen rich niobium nitride.
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Optical properties of ultra-thin niobium nitride films for single photon detectors
… of reactively sputtered ultra-thin films of niobium nitride (NbN) and niobium titanium nitride (NbTiN). Using Variable Angle Spectral Ellipsometry (VASE), I found that the optical properties of NbN films appear to have a critical thickness above which the optical parameters stabilize. I also …
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The ion-beam reactive sputtering process for deposition of niobium nitride thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Laser Processing of Metals and Polymers
… of metals and polymers including polishing niobium surface, producing a superconducting phase niobium nitride and depositing thin films of niobium nitride and organic material (cyclic olefin copolymer).</p> <p>The treated materials were examined by scanning electron microscopy (SEM), …
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Superconducting nanowire single-photon detectors on aluminum nitride photonic integrated circuits
… Among various waveguide materials, aluminum nitride (AlN) is a promising candidate because of its exceptionally wide bandgap, and intrinsic piezoelectric and electro-optic properties. In this Master's thesis, we developed a complete fabrication process for making high-performance niobium …
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Growth of amorphous tungsten silicide and study of the proximity effect at low dimensions for superconducting applications
… out of a hybrid film with layers of both niobium nitride (NbN) and amorphous tungsten silicide (WSi). These hybrid devices use the proximity effect to potentially be more efficient than either of the materials alone. In order to make these devices, we first grew high quality samples of …
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Nano-optical studies of superconducting nanowire single-photon detectors
… of 1550 nm is achieved. SNSPDs based upon niobium nitride (NbN) nanowires fabricated on magnesium oxide (MgO) have been studied. The microscope system has allowed us to map the temporal response (timing jitter and output pulse timing delay) of constricted (non-uniform) SNSPDs. By fitting to …
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Growth defects in CrN/NbN coatings deposited by HIPIMS/UBM techniques
… of their formation, three sets of chromium nitride/niobium nitride (CrN/NbN) coatings were deposited using HIPIMS technique combined with unbalanced magnetron sputtering (UBM) by varying the deposition parameters, i.e. deposition time (t = 15 to 120 min), bias voltage (Ub = - 40 to - 150 V) …
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Radio-Frequency Capacitive Gate-based Sensing for Silicon CMOS Quantum Electronics
… circuit topology is used where superconducting niobium nitride (NbN) inductor is connected in parallel with a single-gate Si NWFET resulting in resonators with loaded Q-factors in the 400-800 range. For a resonator operating at 330 MHz, I have achieved a charge sensitivity of 7.7 $\mu …
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Binding, activation, and transformation of carbon dioxide mediated by anionic metal complexes
The vanadium nitride complex [Na][NV(N['Bu]Ar) 3] reacts with CO to produce the vanadium tris-anilide complex V(N['Bu]Ar)3 and NaNCO. This is the first example of complete denitrogenation of a termainal nitride complex with generation of a lower coordinate metal complex. This reactivity contrasts …
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Preparation and Reactivity of Niobium-Containing Hydrotreating Catalysts
A series of niobium-containing nitride and carbides were prepared by a temperature-programmed synthesis method. The catalysts synthesized comprised a monometallic niobium oxynitride and a new bimetallic oxycarbide supported system, Nb-Mo-O-C/Al₂O₃ (Mo/Nb = 1.2; 1.6; 2.0). In the case of the niobium …
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High resolution spectroscopy of some gaseous transition metal containing diatomic molecules
… - X³Δ and f¹Φ - a¹Δ electronic transitions of niobium nitride (NbN) have been recorded at sub-Doppler resolution by intermodulated laser-induced fluorescence. The C³Π and e¹Π states, which belong to the same electron configuration (4dδ)¹(4dπ)¹, interact strongly with each other by a …