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Haowei Lin, Kai Chen, Mingke Li, Beibei Ji, Yaohui Jia, Xinyu Liu, Jinling Li, Weiqiang Song, Chunlong Guan
We demonstrate that a novel photodetector is constructed by CdS/PPV (poly(p-phenylene vinylene)) homogeneous hybrid nanowire arrays via a simple template-assisted electrochemical co-deposition approach. Owing to the well-matched energy levels between CdS and PPV, the recombination of photogenerated electrons and holes in CdS/PPV hybrid nanowire arrays is greatly inhibited. It is found that the homogeneous hybrid nanowire arrays exhibit remarkably enhanced photoelectric response and the ON/OFF ratio by 17 times compared to individual CdS component...
February 19, 2019: ACS Applied Materials & Interfaces
J A Serrano-Mireles, H M Garnica-Garza
Contrast enhanced radiotherapy is a relatively new treatment modality in which a radiological contrast agent is uploaded into a tumor that is subsequently irradiated with kilovoltage x-ray beams thus maximizing absorption of radiation through the photoelectric effect. As with other treatment modalities, experimental verification of absorbed dose distributions is a necessary step as part of the quality assurance process. In this paper, we address the question of how the response to kilovoltage x-rays exhibited by an ion chamber is modified when a radiological contrast agent is incorporated into the irradiated medium...
February 2, 2019: Applied Radiation and Isotopes
Huijing Xiang, Yu Chen
Serious side effects to surrounding normal tissues and unsatisfactory therapeutic efficacy hamper the further clinic applications of conventional cancer-therapeutic strategies, such as chemotherapy and surgery. The fast development of nanotechnology provides unprecedented superiorities for cancer therapeutics. Externally activatable therapeutic modalities mediated by nanomaterials, relying on highly effective energy transformation to release therapeutic elements/effects (cytotoxic reactive oxygen species, thermal effect, photoelectric effect, Compton effect, cavitation effect, mechanical effect or chemotherapeutic drug) for cancer therapies, categorized and termed as "energy-converting nanomedicine," have arouse considerable concern due to their noninvasiveness, desirable tissue-penetration depth, and accurate modulation of therapeutic dose...
February 18, 2019: Small
Guanglei Ye, Bina Guo
This paper demonstrates a BSN-based portable monitor integrating micro sensors with mobile devices for monitoring and diagnosing obstructive sleep apnea syndrome (OSAS) at home. The system uses a micro hot-film flow sensor to detect respiratory flow, uses tri-axis micro accelerometer to detect body posture and motion intensity, and uses a micro photoelectric sensor to detect oxygen saturation of blood. The real-time vital signs are detected and transmitted wirelessly to a mobile device. The transmitted data are processed and analyzed in the mobile device and can be further transmitted to a remote medical center and physicians through mobile cellular networks or Internet for comprehensively analyzing, assessing, and diagnosing to the diseases...
January 30, 2019: Zhongguo Yi Liao Qi Xie za Zhi, Chinese Journal of Medical Instrumentation
Fuheng You, Mingyue Zhu, Lijun Ding, Yuhuan Xu, Kun Wang
Rational design and fabrication of Z-scheme visible-light-driven photoactive materials have drawn much attention owing to their great potential in handling environment and energy crisis. In this work, Z-scheme Bi2 S3 /nitrogen-doped graphene quantum dots (NGQDs) with superior photoelectric conversion efficiency were designed and fabricated, which demonstrated enhanced photoactivity compared with Bi2 S3 owing to the improved separation efficiency of photogenerated electron and hole pairs. The emphasis was put on designing Z-scheme Bi2 S3 /NGQDs, and then the mechanism of Z-scheme charge transfer mode was verified by the electron spin resonance (ESR) technique...
February 5, 2019: Biosensors & Bioelectronics
Min Cao, Cong Zhang, Zhi Cai, Chengcheng Xiao, Xiaosong Chen, Kongyang Yi, Yingguo Yang, Yunhao Lu, Dacheng Wei
Owing to strong light-matter interaction, two-dimensional (2D) organic crystal is regarded as promising materials for ultrasensitive photodetectors, however it still received limited success due to degraded photoelectrical response and problems in controllable growth. Here, we find the growth of 2D organic crystal obeys Gibbs-Curie-Wulff law, and develop a seed-epitaxial drop-casting method to grow millimeter-sized 1,4-bis(4-methylstyryl)benzene 2D crystals on SiO2 /Si in a thermodynamically controlled process...
February 14, 2019: Nature Communications
Kai Xiao, Lu Chen, Ruotian Chen, Tobias Heil, Saul Daniel Cruz Lemus, Fengtao Fan, Liping Wen, Lei Jiang, Markus Antonietti
The original version of this Article contained errors in Figure 3. In Fig. 3d, the label 'With light irradiation' was originally incorrectly given as 'Without light irradiation'. In Fig. 3f, the label 'Without light irradiation' was originally incorrectly given as 'With light irradiation'. This has been corrected in both the PDF and HTML versions of the Article.
February 14, 2019: Nature Communications
Petr Siyushev, Milos Nesladek, Emilie Bourgeois, Michal Gulka, Jaroslav Hruby, Takashi Yamamoto, Michael Trupke, Tokuyuki Teraji, Junichi Isoya, Fedor Jelezko
Nitrogen-vacancy (NV) centers in diamond have become an important instrument for quantum sensing and quantum information science. However, the readout of NV spin state requires bulky optical setups, limiting fabrication of miniaturized compact devices for practical use. Here we realized photoelectrical detection of magnetic resonance as well as Rabi oscillations on a single-defect level. Furthermore, photoelectrical imaging of individual NV centers at room temperature was demonstrated, surpassing conventional optical readout methods by providing high imaging contrast and signal-to-noise ratio...
February 15, 2019: Science
Xiaojie Ni, Lei Lei, Yu Yu, Junjie Xie, Ming Li, Songwang Yang, Mei Wang, Jiandang Liu, Hongjun Zhang, Bangjiao Ye
Pristine and Br-doped H2 N = CHNH2 Pb(I1-x Br x )3 (FAPb(I1-x Br x )3 , Br content x = 0, 0.05, 0.15, 0.2, 0.3, and 0.4) films were prepared. The effect of Br-doping on phase stability, defect density, and performance of FAPb(I1-x Br x )3 was investigated by x-ray diffraction (XRD), scanning electron microscopy, ultraviolet-visible-near infrared absorbance spectroscopy, x-ray photoemission spectroscopy (XPS), Kelvin probe force microscopy (KPFM), positron annihilation spectroscopy, and current density-voltage (J-V) characteristics...
February 13, 2019: Nanotechnology
J Lindsay, M Meengs, J C Fischer, J Brogan, A Brandl
The identification of radiological sources by analysis of a gamma spectrum usually relies on the location of the set of radionuclide-specific electron energies corresponding to the incident photons interacting by photoelectric absorption in the detection medium. The challenge in low-level detection applications is the identification of these "photopeaks" above the background counts registered in the detector from the natural radiation environment and system noise. For source detection decisions, regions of the gamma spectrum other than at the photopeak energies may provide additional information about the presence of a source and allow for a higher rate of correct identification of a weak source...
February 9, 2019: Health Physics
Muhammad Ahsan Iqbal, Cui Menghua, Adeel Liaqat, Rakba Faiz, Mongur Hossain, Xinsheng Wang, Sabir Hussain, Dang Chunhe, Liu Haining, Wen Wen, Wu Juanxia, Liming Xie
Photodetectors have widespread applications in telecommunication, thermal imaging, bio-medical imaging and so on. Photogating effect, arising from charge trapping at defects and/or interfaces, can have extremely high photoelectric gain, which can benefit to high-sensitivity room temperature photodetection. Here, we introduce thin layered organic CPXs integrated on graphene transistors for the development of hybrid phototransistors with ultra-high photoresponsivity of ~106 A/W in near infrared (NIR) region at room temperature...
February 11, 2019: Nanotechnology
Dongxiao Lu, Jinhua Li, Guohui Lu, Longgui Qin, Deye Liu, Peng Sun, Fengmin Liu, Geyu Lu
To further increase the photoelectric efficiency of dye-sensitized solar cell (DSSC), enhancing the light adsorption of photoanode and suppressing the recombination of photo-generated charges are of great importance. Motivated by this, a novel and efficient three-component CNF/TiO2 /Au heterostructure was successfully constructed and employed as an alternative photoanode material. The as-prepared CNF/TiO2 /Au is characterized by conductive carbon nanofiber (CNF) core, uniform TiO2 outer shell assembled by upright nanorods, and surface modification with well-dispersed Au nanoparticles...
February 2, 2019: Journal of Colloid and Interface Science
Han Liu, Xiangfeng Wei, Zhixiang Zhang, Xunyong Lei, Wenchao Xu, Linbao Luo, Hualing Zeng, Ruifeng Lu, Jiehua Liu
We report a new suspension method to obtain the cubic MAPbBr3 single crystal with a concave surface for the first time. The cubic MAPbBr3 crystal with micro-concavity possesses the good crystallinity and carrier lifetime. The excellent photoelectric performance was provided by the concave based MAPbBr3 photodetectors due to the good light trapping and shortened carrier pathway. As a result, the concave-based photodetector exhibits the superior responsivity of 62.9 A W-1 and 5.43 A W-1 and EQE of 1.50×104% and 1...
February 6, 2019: Journal of Physical Chemistry Letters
Bingzhuo Chen, Zhicen Lu, Hongliang Meng, Ying Chen, Lu Yang, Huaiqin Zhang, Haifeng Xie, Chen Chen
OBJECTIVES: To examine effectiveness of pre-silanization in improving bond performance of multipurpose products such as universal adhesives or self-adhesive resin cements to silica-based ceramics. METHODS: The present study investigated reactions between silanol groups of γ-methacryloxypropyltrimethoxysilane (γ-MPS) and silica, dehydration self-condensation of γ-MPS, and condensation polymerization between γ-MPS and 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP) by using thermodynamic calculations...
January 30, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
Zhaofeng Gao, Jiamin Sun, Mingming Han, Yanxue Yin, Yu Gu, Zaixing Yang, Haibo Zeng
Owing to the high mobility, narrow bandgap, strong spin-orbit coupling and large g-factor, Sb-based III-V nanowires (NWs) attracted significant interests in high-speed electronics, long-wavelength photodetectors and quantum superconductivity in the past decade. In this review, we aim to give an integrated summarization about the recent advances in binary as well as ternary Sb-based III-V NWs, starting from the fundamental properties, NWs growth mechanism, typical synthetic methods to their applications in transistors, photodetectors, and Majorana fermions detection...
February 1, 2019: Nanotechnology
Marie Vidal, Paula Ibáñez, Pedro Guerra, Manlio F Valdivieso-Casique, Raul Rodriguez, Carlos Illana, José Manuel Udías
Low energy X-ray Intra-Operative Radiation Therapy (IORT) is used mostly for breast cancer treatment with spherical applicators. X-ray IORT treatment delivered during surgery (ex: INTRABEAM®, Carl Zeiss) can benefit from accurate and fast dose prediction in a patient 3D volume. However, full Monte Carlo (MC) simulations are time-consuming and no commercial treatment planning system was available for this treatment delivery technique. Therefore, the aim of this work is to develop a dose computation tool based on MC phase space information, which computes fast and accurate dose distributions for spherical and needle INTRABEAM® applicators...
February 1, 2019: Physics in Medicine and Biology
Fei Cao, Dejian Yu, Yu Gu, Jun Chen, Haibo Zeng
Halide perovskites (HPs) with α-phase have been intensively explored as light absorbers in solar cells, while δ-phase HPs are not suitable for photoelectric application owing to their wider bandgap and less competitive semiconducting properties. Here we propose an innovative light-controlled nanorotor based on δ-CsPb(Br/I)3 nanorods. The one-dimensional lattice structure enables habitual growth of single-crystalline nanorods upon controllable iodide incorporation. The nanorods get polarized under a rotating electric field; when light is applied, photogenerated charge carriers are populated to enhance the torque, overcoming the random Brownian motions to force the rotation of the nanorods...
January 31, 2019: Nanoscale
Da Xiong, Weili Deng, Guo Tian, Yuyu Gao, Xiang Chu, Cheng Yan, Long Jin, Yuhan Su, Wei Yan, Weiqing Yang
ZnO-based heterojunction photodetectors have been widely used in various fields such as optical imaging and health monitoring. As for the traditional planar heterojunction interface, their limited optical absorption will place restrictions on the full photoelectric potential of ZnO nanorods, which severely restrains the commercial applications of ZnO-based photodetectors. Herein, using an intrinsically octahedral structure of p-type Cu2O and one-dimensional ZnO arrays, the newly designed serrate-structured heterojunction was constructed, whose unique serrate-structured interface of ZnO/Cu2O is highly conducive to the aggrandizing of optical absorption...
January 30, 2019: Nanoscale
Jun Yin, Lin Cong, Yu Liu, Pengfei Wang, Wanyun Ma, Jia-Lin Zhu, Kaili Jiang, Wei Zhang, Jialin Sun
Graphene is receiving significant attention for use in optoelectronic devices because it exhibits a wide range of desirable electrical properties. Although modified graphene that is fabricated on quantum dots (or similar integration strategies) has shown promise, it has not overcome the requirement for high-speed applications and highly sensitive detection. Herein, we report ion-modulated graphene composite nanostructures that were incorporated into photodetectors. We focus on the dynamical properties of the novel photodetector, and they exhibit extraordinary photoelectric performances (photoresponsivity ~1 A/W, response time ~100 μs) over a broad range of wavelengths from 405 nm to 1064 nm (the maximum external quantum efficiency is greater than 300% at 635 nm with a 10 kHz chopping frequency)...
January 30, 2019: ACS Applied Materials & Interfaces
Dawei Fan, Xin Liu, Chunzhu Bao, Jinhui Feng, Huan Wang, Hongmin Ma, Dan Wu, Qin Wei
A novel and sensitive sandwich-type photoelectrochemical (PEC) immunosensor was developed for the quantitative detection of β-amyloid protein (Aβ). A ITO electrode was sequentially coated with hierarchical porous zinc oxide (ZnO) microspheres with a large specific area, sensitized with tris(bipyridine)ruthenium(II) ion (Ru(bpy)3 2+ ) to achieve high visible light absorption, and modified with cerium-doped cadmium sulfide (Ce-CdS) nanoparticles to enhance the PEC response. Under the stimulation of visible light and ascorbic acid as an efficient electron donor, the photoelectric signal of ZnO/Ru(bpy)3 2+ /Ce-CdS was 70 times that of pure ZnO...
January 21, 2019: Biosensors & Bioelectronics
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