Preparation of “natural” diamonds by HPHT annealing of synthetic diamonds

Fang, Chao; Zhang, Yuewen; Zhang, Zhuangfei; Shan, Chongxin; Shen, Weixia; Jia, Xiaopeng

doi:10.1039/c7ce02013a

Cited by 41 publications

(18 citation statements)

References 29 publications

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“…The single peak at ~750 cm −1 corresponds to Au-S bonds from gold nanoparticles. The additional peaks in the 1950-2,210 cm −1 range represent the artifacts of the diamond ATR setup (Fang et al, 2018). The FTIR results are in good agreement with previous reports (Thamri et al, 2016), confirming the presence of gold decorated -COOH functionalized MWCNTs in the coating.…”

Section: Fourier Transform Infra-red Spectroscopysupporting

confidence: 90%

IoT-Enabled Integrated Smart Wound Sensor for Multiplexed Monitoring of Inflammatory Biomarkers at the Wound Site

Noushin

Hossain

Tabassum

2022

Front. Nanotechnol.

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Chronic wounds that stall at the inflammatory phase of healing may create several life-threatening complications such as tissue damage, septicemia, and organ failures. In order to prevent these adverse clinical outcomes and accelerate the wound healing process, it is crucial to monitor the wound status in real-time so that immediate therapeutic interventions can be implemented. In addition, continuous monitoring of the wound status can prevent drug overdose at the wound site, leading to on-demand and personalized drug delivery. Inflammatory mediators, such as Interleukin-6 (IL-6) and Interleukin-10 (IL-10) are promising indicators for the progression of wound healing and predictors of disease severity. Toward this end, this work reports a flexible wound patch for multiplexed monitoring of IL-6 and IL-10 at the wound site in order to provide real-time feedback on the inflammation phase of the wound. An optimized composition of gold nanoparticles integrated multiwalled carbon nanotube was demonstrated to improve sensor performance substantially. The sensor also exhibited excellent repeatable, reversible, and drift characteristics. A miniaturized Internet-of-things (IoT)-enabled potentiostat was also developed and integrated with the flexible sensor to realize a wearable system. This IoT-enabled wearable device provides a smart and cost-effective solution to improving the existing wound care through continuous, real-time, and in-situ monitoring of multiple wound biomarkers.

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Section: Fourier Transform Infra-red Spectroscopysupporting

confidence: 90%

IoT-Enabled Integrated Smart Wound Sensor for Multiplexed Monitoring of Inflammatory Biomarkers at the Wound Site

Noushin

Hossain

Tabassum

2022

Front. Nanotechnol.

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“…The appearance and relative intensity of these bands depends on the ND brand. These bands could be surface groups bound to metal species or nitrile [ 55 ] or other C–N–C, C–N–N and similar nitrogen-based vibrations [ 56 ], which may be the manifestation of N or N vacancy centers in the ND cores [ 57 ]. These bands were found in graphene [ 12 ] but require more studies in the case of nanodiamonds.…”

Section: Discussionmentioning

confidence: 99%

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

2020

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The qualitative analysis of nanodiamonds by FTIR spectrometry as photoacoustic (FTIR–PAS), diffuse-reflectance (DRIFT), and attenuated total reflection (ATR) modalities was evaluated for rapid and nondestructive analysis and comparison of nanodiamonds. The reproducibility and signal-gathering depth of spectra was compared. The assignment of characteristic bands showed that only six groups of bands were present in spectra of all the modalities with appropriate sensitivity: 1760 (C=O stretch, isolated carboxyl groups); 1640–1632 (H–O–H bend, liquid water); 1400–1370 (non-carboxyl C–O–H in-plane bend and CH2 deformation); 1103 (non-carboxyl C–O stretch); 1060 (in-plane C–H bend, non-aromatic hydrocarbons and carbohydrates); 940 cm−1 (out-of-plane carboxyl C–O–H bend). DRIFT provides the maximum number of bands and is capable of measuring hydrogen-bonded bands and CHx groups. ATR provides the good sensitivity for water and C–H/C–C bands in the range 2000–400 cm−1. FTIR–PAS reveals less bands than DRIFT but more intense bands than ATR–FTIR and shows the maximum sensitivity for absorption bands that do not appear in ATR-IR spectra and are expedient for supporting either DRIFT or FTIR–PAS along with depth-profiling. Thus, all three modalities are required for the full characterization of nanodiamonds surface functional groups.

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“…24 Pre-existing diamonds (natural or synthetic) can also be subject to further treatment by HPHT methods. One such recent study 25 has shown that appropriate annealing of HPHTgrown, N−H codoped SCDs with N content of ∼1000 ppm encourages aggregation of the nitrogen atoms (from C-centers to A-and B-centers). Such annealing reduces the visible coloration of these samples, especially in the {111} faces, thereby increasing their potential appeal and value.…”

Section: Laboratory-based Synthesis Of Diamond and Nitrogen-containin...mentioning

confidence: 99%

Nitrogen in Diamond

et al. 2020

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Nitrogen is ubiquitous in both natural and laboratory-grown diamond, but the number and nature of the nitrogen-containing defects can have a profound effect on the diamond material and its properties. An ever-growing fraction of the supply of diamond appearing on the world market is now lab-grown. Here, we survey recent progress in two complementary diamond synthesis methodshigh pressure high temperature (HPHT) growth and chemical vapour deposition (CVD), how each is allowing ever more precise control of nitrogen incorporation in the resulting diamond, and how the diamond produced by either method can be further processed (e.g. by implantation and/or annealing) to achieve a particular outcome or property. The burgeoning availability of diamond samples grown under well-defined conditions has also enabled huge advances in the characterization and understanding of nitrogen-containing defects in diamondalone, and in association with vacancies, hydrogen and transition metal atoms. Amongst these, the negatively charged nitrogen-vacancy (NV −) defect in diamond is attracting particular current interest on account of the many new and exciting opportunities it offers for, e.g., quantum technologies, nanoscale magnetometry and biosensing. 2 Laboratory Based Synthesis of Diamond and Nitrogen-Containing Diamond 2.1 High Pressure High Temperature (HPHT) Methods. Nature was the inspiration for the HPHT method, by which diamond growth was demonstrated by Swedish company ASEA in 1953 (though not reported at that time) and subsequently by US company General Electric in 1955. 14 , 15 Most present-day HPHT synthesis exploits the temperature-gradient growth (TGG) method developed later in that decade. 16 However, it took many further years before the design and control of HPHT reactors yielded diamonds of

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Preparation of “natural” diamonds by HPHT annealing of synthetic diamonds

Abstract: In this paper, IIa, Ib, N-doped and N–H co-doped diamonds were studied, and the interaction mechanisms between hydrogen and nitrogen in the diamonds were investigated in detail.

Cited by 41 publications

References 29 publications

IoT-Enabled Integrated Smart Wound Sensor for Multiplexed Monitoring of Inflammatory Biomarkers at the Wound Site

IoT-Enabled Integrated Smart Wound Sensor for Multiplexed Monitoring of Inflammatory Biomarkers at the Wound Site

Detonation Nanodiamonds: A Comparison Study by Photoacoustic, Diffuse Reflectance, and Attenuated Total Reflection FTIR Spectroscopies

Nitrogen in Diamond

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