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Low-Power Laser Graphitization of High Pressure—High Temperature Nanodiamond Films. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10093329] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Laser-induced graphitization of 100 nm monocrystals of diamond particles synthesized by high-pressure high-temperature (HP-HT) methods is not typically observed. The current study demonstrates the graphitization of 150 nm HP-HT nanodiamond particles in ca. 20-μm-thick thin films formed on a glass substrate when the intensity of a focused 633 nm He-Ne laser exceeds a threshold of ~ 33 kW/cm2. Graphitization is accompanied by green luminescence. The structure and morphology of the samples were investigated before and after laser excitation while using X-ray diffraction (XRD), Raman spectroscopy, atomic force (AFM), and scanning electron microscopy (SEM). These observations are explained by photoionization of [Ni-N]- and [N]-centers, leading to the excitation of electrons to the conduction band of the HP-HT nanodiamond films and an increase of the local temperature of the sample, causing the transformation of sp3 HP-HT nanodiamonds to sp2-carbon.
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Kratochvílová I, Kovalenko A, Fendrych F, Petráková V, Záliš S, Nesládek M. Tuning of nanodiamond particles' optical properties by structural defects and surface modifications: DFT modelling. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm13525b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Klein PB, Crossfield MD, Freitas JA, Collins AT. Donor-acceptor pair recombination in synthetic type-IIb semiconducting diamond. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:9634-9642. [PMID: 9977627 DOI: 10.1103/physrevb.51.9634] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Photochromic nickel centers in diamons. J STRUCT CHEM+ 1994. [DOI: 10.1007/bf02578113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Jinlong Y, Manhong Z, Kelin W. Local structure and electronic properties of an interstitial Ni+ impurity in diamond. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:15525-15530. [PMID: 10010682 DOI: 10.1103/physrevb.49.15525] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Nazaré MH, Neves AJ, Davies G. Optical studies of the 1.40-eV Ni center in diamond. PHYSICAL REVIEW. B, CONDENSED MATTER 1991; 43:14196-14205. [PMID: 9997290 DOI: 10.1103/physrevb.43.14196] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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