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Graphene/semi-insulating single crystal CdTe Schottky-type heterojunction X- and ?-Ray Radiation Detectors.

ABSTRACT: We developed a new concept of X- and ?-ray radiation semiconductor detectors based on a large area graphene/semi-insulating single crystal CdTe Schottky-type heterojunction. These two terminal electronic devices can be easily fabricated by forming a Van der Waals contact between large area chemical vapor deposited graphene and CdTe substrates in air and at room temperature. This approach significantly reduces the fabrication cost and improves the reproducibility and stability of electrical properties. A detailed analysis of their AC and DC electrical properties was carried out in order to determine the width of the space charge region and dominant charge transport mechanisms at reverse bias. The unoptimized graphene/CdTe heterojunction detectors exhibited a promising spectral resolution of 241Am (59?keV) and 137Cs (662?keV) isotope radiation at room temperature.

SUBMITTER: Brus VV

PROVIDER: S-EPMC6355853 | biostudies-other | 2019 Jan

REPOSITORIES: biostudies-other

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Graphene/semi-insulating single crystal CdTe Schottky-type heterojunction X- and γ-Ray Radiation Detectors.

Brus V V VV Maslyanchuk O L OL Solovan M M MM Maryanchuk P D PD Fodchuk I I Gnatyuk V A VA Vakhnyak N D ND Melnychuk S V SV Aoki T T

Scientific reports 20190131 1

We developed a new concept of X- and γ-ray radiation semiconductor detectors based on a large area graphene/semi-insulating single crystal CdTe Schottky-type heterojunction. These two terminal electronic devices can be easily fabricated by forming a Van der Waals contact between large area chemical vapor deposited graphene and CdTe substrates in air and at room temperature. This approach significantly reduces the fabrication cost and improves the reproducibility and stability of electrical prope ...[more]

PMID: 30705310

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Project description:Background: The current clinical treatment of osteomyelitis is limited by the emergence of drug-resistant bacteria, which often leads to the failure of traditional antibiotic treatment and large bone defects. Sonodynamic therapy (SDT) is a new strategy that is widely used to overcome the problem of bacterial resistance to antibiotic therapy as well as poor tissue penetration using near-infrared light in photodynamic therapy (PDT). Therefore, it is necessary to develop a new sonosensitizer that can kill bacteria and promote bone repair. Methods: Herein, we developed a sonosensitizer, porphyrin metal-organic framework (HNTM), with a Schottky junction modified by Ti3C2 nanosheets (HN-Ti3C2) for highly efficient sonodynamic therapy of osteomyelitis and bone regeneration. Results: Ti3C2 greatly improves the acoustic catalytic performance by rapidly transferring the charge carriers generated by HNTM under ultrasound (US) irradiation, which killing drug-resistant bacteria through the generation of large amounts of reactive oxygen species (ROS). And HN-Ti3C2 shows excellent 99.75% antibacterial effectiveness against MRSA. In addition, HN-Ti3C2 generates a sonocurrent under low-intensity US to promote the repair of bone defects for a long time period. Mechanistic research using CCK-8 and RNA-seq showed that HN-Ti3C2 nanocomposites can promote the proliferation of stem cells by regulating the cell cycle, DNA replication, and apoptosis. In addition, after low-intensity US irradiation, HN-Ti3C2 promotes osteogenic differentiation via some key signaling pathways, including the calcium, Wnt, and TGF-beta signaling pathways, according to the Kyoto Encyclopedia of Genes and Genomes (KEGG). In a MRSA-infected rat tibial osteomyelitis model, HN-Ti3C2 successfully eliminated the infection and significantly improved bone regeneration under US irradiation. Conclusion: This study indicates that engineered HN-Ti3C2 is a distinctive nanocomposite for successful osteomyelitis treatment.

Dataset Information

Graphene/semi-insulating single crystal CdTe Schottky-type heterojunction X- and ?-Ray Radiation Detectors.

Publications

Graphene/semi-insulating single crystal CdTe Schottky-type heterojunction X- and γ-Ray Radiation Detectors.

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