Repository Data for Magic Diamond: Covalent Bond Formation of Melamine and other Amines on Nanodiamond Surfaces
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Includes the data for X-ray absorption spectroscopy, resonant inelastic X-ray scattering maps, X-ray photoelectron spectroscopy and FTIR spectroscopy. The uploaded data is for the manuscript entitled Magic Diamond: Covalent Bond Formation of Melamine and other Amines on Nanodiamond Surfaces. ACS Omega and the American Chemical Society highly encourage open source sharing of data. Abstract: High-temperature high-pressure (HPHT) nanodiamond (ND) hosts nitrogen-vacancy (NV) centers, solid-state qubits that enable room-temperature quantum sensing by all-optical magnetometry, electrometry, and thermometry. However, covalent surface functionalization of nanoscale diamond remains largely limited to carboxylate-based chemistries. Amine termination is particularly attractive because theoretical studies predict suppression of mid-gap states and extended electron-spin coherence times. Recently, chemical activation of alcohol-terminated NDs to alkyl bromides (ND-Br) using SOBr₂ has enabled nucleophilic substitution through a carbocation intermediate, allowing formation of simple amine terminations. Here, we evaluate whether sterically demanding amines can form covalent diamond–nitrogen bonds on ND-Br surfaces. ND-Br was reacted with branched, linear, and cyclic amines, including polyethyleneimine, diethylenetriamine, and melamine. X-ray spectroscopies were used to confirm successful amination and to probe the resulting electronic structure at the diamond–amine interface. These results expand the chemical toolbox for tuning diamond surface dipoles and electron affinity, providing new pathways for engineering nanodiamond surfaces for quantum sensing and photocatalysis applications.
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Please see the manuscript for full details. Magic Diamond: Covalent Bond Formation of Melamine and other Amines on Nanodiamond Surfaces Tsz Ching Cheung 1,ξ, Camron X. Stokes1, ξ, Jorge A. Lopez-Rosas 1,ξ, Grace Olivia Drew 1, Joy Lillian Drew 1, Anoushka Lakshmi1, Nivita Susendran1, Muhammed Qasim1, Cynthia Melendrez4, Sang-Jun Lee3, Avery Green7, Jia Lu8, Virginia Altoe6, Dennis Nordlund3, Kent Irwin3,5, & Abraham Wolcott1,2* 1 Department of Chemistry San José State University 1 Washington Square San José, CA 95192, U.S.A. 2Department of Physics CUNY-The City College of New York 160 Covent Ave. New York, NY 10031, USA. 3 Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 4 Linac Coherent Light Source SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park, CA 94025 5 Stanford University Department of Physics 450 Jane Stanford Way Palo Alto, CA 94025 6 The Molecular Foundry Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley, CA U.S.A. 7Covalent Metrology 927 Thompson Pl Sunnyvale, CA 94085, U.S.A. 8EAG Laboratories 810 Kifer Rd Sunnyvale, CA 94086, U.S.A.