Phase Transformation and Evolution of Localized Surface Plasmon Resonance in Cu_2–<i>x</i>S Thin Films Deposited at 60 °C

Cu_2–<i>x</i>S (0 ≤ x ≤ 1) thin films deposited at low temperatures (<95 °C) have rich polymorphs due to small differences in Gibbs free energy of formation, which is critical for understanding their fundamental properties. In this work, phase transformation from djurleite to covellite is obtained by simple chemical bath deposition (CBD) without using oxidizing/reducing agents. Cu_2–<i>x</i>S thin films synthesized using cetyltrimethylammonium bromide as a surfactant at 60 °C for different deposition time exhibit red shift in optical absorption due to quantum size effect and blue shift in localized surface plasmon resonance in the near-infrared region originating from increased copper vacancy. The surface morphology of the Cu_2–<i>x</i>S thin films is influenced by the surfactant, which in turn alters the optoelectronics properties. The preferential bonding between Cu and S is determined by hydrolysis of thioacetamide to release sulfides (S^2–) and disulfides (S₂^2–) and the kinetics to reduce Cu²⁺ to Cu⁺ leading to mixed phase formation and an increase in surface to volume ratio. Through X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis, it is confirmed that both Cu²⁺ and S^2– are reduced with time of deposition and form covellite Cu–S₂^2––Cu bonds

CNT@rGO@MoCuSe Composite as an Efficient Counter Electrode for Quantum Dot-Sensitized Solar Cells

This paper reports an efficient and simple strategy for the synthesis of molybdenum copper selenide (MoCuSe) nanoparticles decorated with a combination of a carbon nanotube (CNT) network and reduced graphene oxide (rGO) nanosheets to form an integrated hybrid architecture (CNT@rGO@MoCuSe) using a two-step hydrothermal approach. The synthesized hybrid CNT@rGO@MoCuSe material onto the Ni foam substrate is applied successfully as an effective counter electrode (CE) in quantum dot-sensitized solar cells (QDSSCs). A highly conductive CNT@rGO network grown on electrochemically active MoCuSe particles provides a large surface area and exhibits a rapid electron transport rate at the interface of CE/electrolyte. As a result, the QDSSC with the designed CNT@rGO@MoCuSe CE shows a higher power conversion efficiency of 8.28% under 1 sun (100 mW cm^–2) irradiation, which is almost double the efficiency of 4.04% for the QDSSC with the MoCuSe CE. Furthermore, the QDSSC based on the CNT@rGO@MoCuSe CE delivers superior stability at a working state for over 100 h. Therefore, CNT@rGO@MoCuSe is very promising as a stable and efficient CE for QDSSCs and offers new opportunities for the development of hybrid, effective, and robust materials for energy-related fields

Inhibition of Redox Behaviors in Hierarchically Structured Manganese Cobalt Phosphate Supercapacitor Performance by Surface Trivalent Cations

The stability and performance of supercapacitor devices are limited by the diffusion-controlled redox process occurring at materials’ surfaces. Phosphate-based metal oxides could be effectively used as pseudocapacitors because of their polar nature. However, electrochemical energy storage applications of Mn–Co-based phosphate materials and their related kinetics studies have been rarely reported. In this work, we have reported a morphology-tuned Mn_<i>x</i>Co_3–<i>x</i>(PO₄)₂·8H₂O (MCP) spinel compound synthesized by a one-step hydrothermal method. Detailed physical and chemical insights of the active material coated on the nickel substrate are examined by X-ray diffraction, field-emission scanning electron microscopy, field-emission transmission electron microscopy, and high-resolution X-ray photoelectron spectroscopy analyses. Physiochemical studies reveal that the well-defined redox behavior usually observed in Co²⁺/Ni²⁺ surface-terminated compounds is suppressed by reducing the divalent cation density with an increased Co³⁺ and Mn³⁺ surface states. A uniform and dense leaflike morphology observed in the MnCo₂ phosphate compound with an increased surface area enhances the electrochemical energy storage performance. The high polar nature of P–O bonding formed at the surface leads to a higher rate of polarization and a very low relaxation time, resulting in a perfect square-shaped cyclic voltagram and triangular-shaped galvanostatic charge and discharge curve. We have achieved a highly pseudocapacitive MCP, and it can be used as a vital candidate in supercapacitor energy storage applications

Supporting Information from Influence of solvents in the preparation of cobalt sulfide for supercapacitors

In this study, cobalt sulfide (CoS) electrodes are synthesized using various solvents such as water, ethanol and a combination of the two via a facile chemical bath deposition method on Ni foam. The crystalline nature, chemical states and surface morphology of the prepared CoS nanoparticles are characterized using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy and transition electron microscopy. The electrochemical properties of CoS electrodes are also evaluated using cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. When used as an electrode for a supercapacitor, CoS prepared with ethanol as a solvent exhibits a capacitance of 41.36 F g⁻¹ at 1.5 A g⁻¹, which is significantly better than that prepared using water and ethanol (31.66 and 18.94 F g⁻¹ at 1.5 A g⁻¹, respectively). This superior capacitance is attributed to the ideal surface morphology of the solvent, which allows for easy diffusion of electrolyte ions into the inner region of the electrode. High electrical conduction enables a high rate capability. These results suggest that CoS nanoparticles are highly promising for energy storage applications as well as photocatalysis, electrocatalysis, water splitting and solar cells, among others. These results show that the CoS is promising positive electrode materials for practical supercapacitor

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Description of studies of tuberculosis after hematopoietic stem cell transplantation published from 1990 to January 2015.

<p>Description of studies of tuberculosis after hematopoietic stem cell transplantation published from 1990 to January 2015.</p

Clinical characteristics of patients with tuberculosis after allogeneic hematopoietic stem cell transplantation.

<p>Clinical characteristics of patients with tuberculosis after allogeneic hematopoietic stem cell transplantation.</p

Overall characteristics of allogeneic hematopoietic stem cell transplantation recipients with or without tuberculosis.

<p>Overall characteristics of allogeneic hematopoietic stem cell transplantation recipients with or without tuberculosis.</p

Additional file 1: Table S1. of High WT1 expression is an early predictor for relapse in patients with acute promyelocytic leukemia in first remission with negative PML-RARa after anthracycline-based chemotherapy: a single-center cohort study

Multivariate analysis in APL patients with CMR. Figure S1. Consort diagram of enrolled patients in this study. Underlined patients were excluded in this study (n=25). Abbreviation: APL, acute promyelocytic leukemia; ATRA, all-trans retinoic acid; CR, complete remission, CMR, complete molecular response; WT1, Wilms tumor 1. Figure S2. Comparison of PML-RARa and WT1 expression levels between relapsed and non-relapsed patients from diagnosis to relapse or 1 year after starting maintenance for non-relapsed patients. (DOCX 152 kb

Risk factors for tuberculosis in patients after allogeneic hematopoietic stem cell transplantation.

<p>Risk factors for tuberculosis in patients after allogeneic hematopoietic stem cell transplantation.</p