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https://www.readbyqxmd.com/read/28727458/unraveling-the-high-voc-and-high-performance-of-integrated-perovskite-organic-bulk-heterojunction-solar-cells
#1
Shiqi Dong, Yongsheng Liu, Ziruo Hong, En-Ping Yao, Pengyu Sun, Lei Meng, Yuze Lin, Jinsong Huang, Gang Li, Yang Yang
We have demonstrated high performance integrated perovskite/bulk-heterojunction (BHJ) solar cells due to the low carrier recombination velocity, high open circuit voltage (Voc) and increased light absorption ability in near-infrared (NIR) region of integrated devices. In particular, we find that the Voc of the integrated devices is dominated by (or pinned to) the perovskite cells, not the OPV cells. A Quasi-Fermi Level Pinning Model was proposed to understand the working mechanism and the origin of the Voc of the integrated perovskite/BHJ solar cell, which following that of the perovskite solar cell and is much higher than that of the low bandgap polymer based organic BHJ solar cell...
July 20, 2017: Nano Letters
https://www.readbyqxmd.com/read/28726726/leds-sources-and-intrinsically-bandwidth-limited-detectors
#2
Roberto Filippo, Emanuele Taralli, Mauro Rajteri
The increasing demand for light emitting diodes (LEDs) is driven by a number of application categories, including display backlighting, communications, signage, and general illumination. Nowadays, they have also become attractive candidates as new photometric standards. In recent years, LEDs have started to be applied as wavelength-selective photo-detectors as well. Nevertheless, manufacturers' datasheets are limited about LEDs used as sources in terms of degradation with operating time (aging) or shifting of the emission spectrum as a function of the forward current...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726368/mussel-inspired-polydopamine-coated-lanthanide-nanoparticles-for-nir-ii-ct-dual-imaging-and-photothermal-therapy
#3
Yu Dai, Dongpeng Yang, Danping Yu, Cong Cao, Qiuhong Wang, Songhai Xie, Liang Shen, Wei Feng, Fuyou Li
Nanomedicine has attracted substantial attentions for accurate diagnosis or treatment of carcinoma in recent years. Nd3+ doped lanthanide nanophosphors based near-infrared-II (NIR-II) optical imaging is widely used for deep penetration tissue imaging while X-ray computed tomography (CT) is well-suited for in vivo imaging. Polymer coated lanthanide nanophosphors were increasingly used as both diagnostics and therapies for tumor in vivo. However, the bio-compatibility of nanocomposites and efficiency of tumor ablation should be taken into consideration when construct of a nanotheranostic probe...
July 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28725242/focal-application-of-low-dose-rate-brachytherapy-for-prostate-cancer-a-pilot-study
#4
S Sara Mahdavi, Ingrid T Spadinger, Septimiu E Salcudean, Piotr Kozlowski, Silvia D Chang, Tony Ng, Julio Lobo, Guy Nir, Hamid Moradi, Michael Peacock, W James Morris
PURPOSE: To evaluate the feasibility and to report the early outcomes of focal treatment of prostate cancer using low-dose-rate brachytherapy (LDR-PB). MATERIAL AND METHODS: Seventeen patients were screened with multi-parametric magnetic resonance imaging (mpMRI), 14 of whom proceeded to receive trans-perineal template mapping biopsy (TTMB). Focal LDR-PB was performed on five eligible patients using dual air kerma strength treatment plans based on planning target volumes derived from cancer locations and determined by TTMB...
June 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28724190/testing-limits-of-bophy-platform-preparation-characterization-and-theoretical-modeling-of-bophys-bophys-with-electron-withdrawing-groups-at-b-pyrrolic-and-bridging-positions
#5
Victor N Nemykin, Yuriy V Zatsikha, Dion B Nemez, Rebecca L Davis, Simarpreet Singh, David E Herbert, Alex J King, Christopher J Ziegler
Several BOPHY derivatives with and without ferrocene fragments and with electron-withdrawing carbethoxy groups appended to the -pyrrolic positions have been prepared and characterized by NMR, UV-Vis-NIR, APCI MS, and fluorescence spectroscopy as well as X-ray crystallography. The redox properties of new BOPHYs were probed by electrochemical (CV and DPV) and spectroelectrochemical methods. In attempt for the preparation of the BOPHY derivatives with cyano group at bridging position using similar to recently communicated BODIPY cyanation approach (Chem...
July 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28723697/the-history-and-future-of-ablative-neurosurgery-for-major-depressive-disorder
#6
Matthew Volpini, Peter Giacobbe, G Rees Cosgrove, Anthony Levitt, Andres M Lozano, Nir Lipsman
BACKGROUND: There is an urgent need to develop safe and effective treatments for patients with treatment-resistant depression (TRD). Several neurosurgical procedures have been developed to treat the dysfunctional brain circuits implicated in major depression. OBJECTIVES: This review describes the most common ablative procedures used to treat major depressive disorder: anterior cingulotomy, subcaudate tractotomy, limbic leucotomy, and anterior capsulotomy. The efficacy and safety of each are discussed and compared with other current and emerging modalities, including deep brain stimulation (DBS) and MR-guided focused ultrasound (MRgFUS)...
July 20, 2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28723592/effects-of-near-infrared-radiation-on-dna-dls-and-atr-ftir-study
#7
Katarzyna Szymborska-Małek, Małgorzata Komorowska, Marlena Gąsior-Głogowska
We presume that the primary effect of Near Infrared (NIR) radiation on aqueous solutions of biological molecules concerns modification of hydrogen bonded structures mainly the global and the hydration shell water molecules. Since water has a significant influence on the DNA structure, we expect that the thermal stability of DNA could be modified by NIR radiation. The herring sperm DNA was exposed to NIR radiation (700-1100nm) for 5, 10, and 20min periods. The temperature dependent infrared measurements were done for the thin films formed on the diamond ATR crystal from evaporated DNA solutions exposed and unexposed to NIR radiation...
July 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28722819/self-targeting-immune-transparent-plasma-protein-coated-nanocomplex-for-noninvasive-photothermal-anticancer-therapy
#8
Fwu-Long Mi, Thierry Burnouf, Shih-Yuan Lu, Yu-Jen Lu, Kun-Ying Lu, Yi-Cheng Ho, Chang-Yi Kuo, Er-Yuan Chuang
Cancer cells exhibit specific physiological differences compared to normal cells. Most surface membranes of cancer cells are characterized by high expression of given protein receptors, such as albumin, transferrin, and growth factors that are also present in the plasma of patients themselves, but are lacking on the surface of normal cells. These distinct features between cancer and normal cells can serve as a niche for developing specific treatment strategies. Near-infrared (NIR)-light-triggered therapy platforms are an interesting novel avenue for use in clinical nanomedicine...
July 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28722337/validation-of-brain-derived-signals-in-near-infrared-spectroscopy-through-multivoxel-analysis-of-concurrent-functional-magnetic-resonance-imaging
#9
Yoshiya Moriguchi, Takamasa Noda, Kosei Nakayashiki, Yohei Takata, Shiori Setoyama, Shingo Kawasaki, Yoshihiko Kunisato, Kazuo Mishima, Kazuyuki Nakagome, Takashi Hanakawa
Near-infrared spectroscopy (NIRS) is a convenient and safe brain-mapping tool. However, its inevitable confounding with hemodynamic responses outside the brain, especially in the frontotemporal head, has questioned its validity. Some researchers attempted to validate NIRS signals through concurrent measurements with functional magnetic resonance imaging (fMRI), but, counterintuitively, NIRS signals rarely correlate with local fMRI signals in NIRS channels, although both mapping techniques should measure the same hemoglobin concentration...
July 19, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28722228/combined-effect-of-using-near-infrared-spectroscopy-for-nutritional-evaluation-of-feed-ingredients-and-non-starch-polysaccharide-carbohydrase-complex-on-performance-of-broiler-chickens
#10
Roberto Montanhini Neto, Eric N'Guetta, Cecile Gady, Maria Francesch, Aurélie Preynat
This study was carried out to evaluate the combined effect of using near-infrared spectroscopy (NIRS) for nutritional evaluation of feed ingredients and the addition of non-starch polysaccharide carbohydrase complex (NSP enzymes) on the growth performance of broilers fed diets produced with low-quality wheat and soybean meal. A 2 × 2 trial design was performed, with seven replicates of 40 male Ross 308 broilers per treatment, evaluating the effect of the addition of NSP enzymes and the ingredients' nutritional matrix based on table values or NIRS values...
July 19, 2017: Animal Science Journal, Nihon Chikusan Gakkaihō
https://www.readbyqxmd.com/read/28721722/pillar-5-arene-based-supramolecular-plasmonic-thin-films-for-label-free-quantitative-and-multiplex-sers-detection
#11
Verónica Montes García, Borja Gómez-González, Diego M Solís, Jose M Taboada, Norman Jiménez Otero, Jacobo de Uña-Álvarez, Fernando Obelleiro, Luis García-Río, Jorge Perez-Juste, Isabel Pastoriza-Santos
Novel plasmonic thin films based on electrostatic layer-by-layer (LbL) deposition of citrate-stabilized Au nanoparticles (NPs) and ammonium pillar[5]arene (AP[5]A) has been developed. The supramolecular-induced LbL assembly of the plasmonic nanoparticles yields to the formation of controlled hot-spots with uniform interparticle distances. At the same time this strategy allows to modulate the density and dimensions of the Au aggregates, and therefore the optical response, on the thin film with the number of AuNP-AP[5]A deposition cycles...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28721421/a-pr-3-doping-strategy-for-simultaneously-optimizing-the-size-and-near-infrared-persistent-luminescence-of-zggo-cr-3-nanoparticles-for-potential-bio-imaging
#12
Zheng Gong, Yuxue Liu, Jian Yang, Duanting Yan, Hancheng Zhu, Chunguang Liu, Changshan Xu, Hong Zhang
Spinel-phase Zn2Ga2.98-xGe0.75O8:Cr0.020,Prx (ZGGO:Cr(3+),Pr(3+)) near infrared (NIR) persistent luminescence nanoparticles (PLNPs) with different amounts of Pr(3+) dopant were prepared by a hydrothermal method in combination with a subsequent annealing in a vacuum. For these nanoparticles, the averaged particle size decreases from 64 to 37 nm with increasing Pr(3+) doping concentration from 0 to 0.025 and Cr(3+) and Pr(3+) ions are uniformly doped into the interior and surface of a single nanoparticle. It can be found that Pr(3+) doping leads to the appearance of more anti-site pairs () around distorted octahedral Cr(3+) ions and enhanced NIR emissions around 697 nm, which originate from the (2)E((2)G) → (4)A2((4)F) and (4)T2((4)F) → (4)A2((4)F) transitions of the interior and surface Cr(3+) ions in the nanoparticles...
July 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28721053/reduced-prefrontal-activation-during-verbal-fluency-task-in-chronic-insomnia-disorder-a-multichannel-near-infrared-spectroscopy-study
#13
Jing-Jing Sun, Xiao-Min Liu, Chen-Yu Shen, Xiao-Qian Zhang, Gao-Xiang Sun, Kun Feng, Bo Xu, Xia-Jin Ren, Xiang-Yun Ma, Po-Zi Liu
PURPOSE: Daytime complaints such as memory and attention deficits and failure to accomplish daily tasks are common in insomnia patients. However, objective psychological tests to detect cognitive impairment are equivocal. Neural function associated with cognitive performance may explain the discrepancy. The aim of this study was to investigate the hemodynamic response patterns of patients with chronic insomnia disorder (CID) using the noninvasive and low-cost functional neuroimaging technique of multichannel near-infrared spectroscopy (NIRS) in order to identify changes of neural function associated with cognitive performance...
2017: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/28720536/a-diffusing-wave-spectroscopy-study-of-pharmaceutical-emulsions-for-physical-stability-assessment
#14
Andreas Niederquell, Alexandra H E Machado, Martin Kuentz
Emulsions are broadly used in pharmaceutics either as intermediate products or as final dosage forms. Such disperse systems are only kinetically stabilized and therefore early detection of physical instability is highly desirable. This work employed diffusing wave spectroscopy (DWS) to study a series of model emulsions that were categorized, based on their composition, as either "simple" or "complex". DWS data were compared with results of droplet size imaging, apparent viscosity obtained by microfluidics, and near-infrared (NIR) analytical centrifugation...
July 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28719741/macroscopic-strain-induced-transition-from-quasi-infinite-gold-nanoparticle-chains-to-defined-plasmonic-oligomers
#15
Anja Maria Steiner, Martin Mayer, Maximilian Seuss, Svetoslav Nikolov, Kenneth D Harris, Alexander Alexeev, Christian Kuttner, Tobias A F Koenig, Andreas Fery
We investigate the formation of chains of few plasmonic nanoparticles - so called plasmonic oligomers - by strain induced fragmentation of linear particle assemblies. Detailed investigations of the fragmentation process are conducted by in-situ atomic force microscopy (AFM) and UV-vis-NIR spectroscopy. Based on these experimental results and mechanical simulations computed by the lattice spring model (LSM), we propose a formation mechanism which explains the observed decrease of chain polydispersity upon increasing strain and provides experimental guidelines for tailoring chain length distribution...
July 18, 2017: ACS Nano
https://www.readbyqxmd.com/read/28719080/near-infrared-quantum-dots-in-biomedical-applications-current-status-and-future-perspective
#16
REVIEW
Peng Zhao, Quan Xu, Jia Tao, Zongwen Jin, Yue Pan, Changmin Yu, Zhiqiang Yu
To address the requirements of biomedical applications including biosensing, bioimaging, and drug delivery, fluorescent nanomaterials served as efficient tools in many cases. Among them, near-infrared quantum dots (NIR QDs) have been used as novel fluorescent labels for their binary advantages of both QDs and NIR light. In this review, through collecting references in recent 10 years, we have introduced basic structures and properties of NIR QDs and summarized the classification and the related synthetic methods...
July 18, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28718789/flavonoid-and-antioxidant-capacity-of-propolis-prediction-using-near-infrared-spectroscopy
#17
Eddy Betances-Salcedo, Isabel Revilla, Ana M Vivar-Quintana, M Inmaculada González-Martín
The use of propolis as a dietary supplement or as an ingredient in different food products is increasing, due to its antioxidant and bactericidal properties. These nutritional properties directly depend on its phenolic composition. For this reason, this study analysed the total contents of flavones and flavonols, flavanones and dihydroflavonols, and the antioxidant capacity by using the methods of ABTS and linoleic acid/β-carotene in 99 samples of propolis from Spain and Chile. A rapid method was developed for quantifying these parameters in raw propolis using near infrared (NIR) spectroscopy with a remote reflectance fibre-optic probe applied directly to the ground-up sample...
July 18, 2017: Sensors
https://www.readbyqxmd.com/read/28718260/cerebral-oximetry-use-for-cardiac-surgery
#18
Syed Shahmeer Raza, Farhan Ullah, Chandni, Edward Bruce Savage
BACKGROUND: Studies have shown maintaining good cerebral perfusion during Cardiac Surgeries is very important in terms of patient outcomes and reducing the hospital stay, which may have its financial and clinical implications. The aim of this review study was to determine the effectiveness of Cerebral Oximetry (Transcranial Near-Infrared Spectroscopy-NIRS to monitor cerebral oxygenation) for Cardiac Surgery and to propose a possible concluding remark about its potential applications, overall clinical value and whether to keep using it or not...
April 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/28718216/one-compound-based-highly-efficient-deep-red-to-near-infrared-thermally-activated-delayed-fluorescence-organic-solid-films-and-electroluminescent-devices
#19
Yue Wang, Chenglong Li, Ruihong Duan, Baoyan Liang, Guangchao Han, Shipan Wang, Kaiqi Ye, Yu Liu, Yuanping Yi
The design and synthesis of highly efficient deep red (DR) and near-infrared (NIR) organic emitting materials with characteristic of thermally activated delayed fluorescence (TADF) still remains a great challenge. In this contribution, we developed a strategy to construct TADF organic solid films with strong DR or NIR emission feature. The triphenylamine (TPA) and quinoxaline-6,7-dicarbonitrile (QCN) were respectively employed as electron donor (D) and acceptor (A) to synthesize a TADF compound, TPA-QCN. The TPA-QCN molecule with orange-red emission in solution was employed as a dopant to prepare DR and NIR luminescent solid thin films...
July 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28717647/intracranial-hematoma-detection-by-near-infrared-spectroscopy-in-a-helicopter-emergency-medical-service-practical-experience
#20
Patrick Schober, Sebastiaan M Bossers, Lothar A Schwarte
In (helicopter) emergency medical services, (H)EMS, the prehospital detection of intracranial hematomas should improve patient care and the triage to specialized neurosurgical hospitals. Recently, noninvasive detection of intracranial hematomas became possible by applying transcranial near infrared spectroscopy (NIRS). Herein, second-generation devices are currently available, for example, the Infrascanner 2000 (Infrascan), that appear suited also for prehospital (H)EMS applications. Since (H)EMS operations are time-critical, we studied the Infrascanner 2000 as a "first-time-right" monitor in healthy volunteers (n = 17, hospital employees, no neurologic history)...
2017: BioMed Research International
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