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Featured researches published by Mei Yan.


Inorganic Chemistry | 2012

Morphology-Controlled Synthesis of W18O49 Nanostructures and Their Near-Infrared Absorption Properties

Chongshen Guo; Shu Yin; Mei Yan; Makoto Kobayashi; Masato Kakihana; Tsugio Sato

The morphology-controlled synthesis and near-infrared (NIR) absorption properties of W(18)O(49) were systematically investigated for the application of innovative energy-saving windows. Various morphologies of W(18)O(49), such as nanorods, nanofibers, nanograins, nanoassembles, nanoplates, and nanoparticles, with various sizes were successfully synthesized by solvothermal reactions using organic alcohols as reaction media and WCl(6), W(EtO)(6), and WO(3) solids as the tungsten source. W(18)O(49) nanorods of less than 50 nm in length showed the best optical performance as an effective solar filter, which realized high transmittance in the visible region as well as excellent shielding properties of NIR light. Meanwhile, the W(18)O(49) nanorods also exhibited strong absorption of NIR light and instantaneous conversion of the absorbed photoenergy to the local heat.


Journal of Materials Chemistry | 2011

Facile synthesis of homogeneous CsxWO3 nanorods with excellent low-emissivity and NIR shielding property by a water controlled-release process

Chongshen Guo; Shu Yin; Mei Yan; Tsugio Sato

A systematic investigation of the synthesis of homogenous CsxWO3 nanorods by a designed water-controlled release process was carried out. The results revealed that the uniform rod-like CsxWO3 nanoparticles with a Cs/W atomic ratio of ca. 0.33 can be obtained by using 20 vol% CH3COOH–80 vol% CH3CH2OH mixed solution as a reaction solvent at 240 °C for 20 h. The morphology of products were changed depending on the speed of water-releasing process, meanwhile, the Cs/W atomic ratio could be controlled by both the amount of released water and the reaction temperature. CsxWO3 nanorods showed a high transmittance in the visible light region and excellent shielding ability of near infrared (NIR) lights, indicating that CsxWO3 nanorods have a suitable characteristic as solar filter applications.


Journal of Materials Chemistry | 2010

Novel synthesis of homogenous CsxWO3 nanorods with excellent NIR shielding properties by a water controlled-release solvothermal process

Chongshen Guo; Shu Yin; Peilin Zhang; Mei Yan; Kenji Adachi; Takeshi Chonan; Tsugio Sato

Nanosize homogenous rod-like tungsten bronze CsxWO3 with excellent NIR shielding ability was successfully synthesized by a novel and facile water controlled-release solvothermal process (WCRSP).


Nanoscale | 2016

WO3−x sensitized TiO2 spheres with full-spectrum-driven photocatalytic activities from UV to near infrared

Mei Yan; Guilian Li; Chongshen Guo; Wei Guo; Dandan Ding; Shouhao Zhang; Shaoqin Liu

To make full use of solar energy for photocatalytic reactions, in this work, we developed full-spectrum-responsive photocatalysts with noteworthy photocatalytic activities under either UV, visible or even near infrared irradiation for the photodegradation of methylene blue. The core-shell structure of TiO2@WO3-x is designed from the consideration of combining the full-spectrum photo-absorption properties of WO3-x with the excellent semiconductor properties of TiO2. As expected, the WO3-x sensitized TiO2 sphere gives rise to a prominently strong optical absorption in the whole region of 300-2500 nm and thus displays desired photocatalytic properties for the full utilization of all solar energy, especially in the unexploited NIR part, which accounts for most of the sunlight. Encouraged by the above exciting photocatalytic outcome, we then go further to propose a plausible mechanism for interpreting the NIR-driven photocatalytic properties, which is based on the hypothesis of low-valent W5+ site induced free electrons and evidence-based ESR results.


Advanced Materials | 2016

Target Delivery of a Novel Antitumor Organoplatinum(IV)-Substituted Polyoxometalate Complex for Safer and More Effective Colorectal Cancer Therapy In Vivo

Tiedong Sun; Wei Cui; Mei Yan; Geng Qin; Wei Guo; Hongxi Gu; Shaoqin Liu; Qiong Wu

An inactive organoplatinum(IV)-substituted polyoxometalate is developed as an efficient and nontoxic prodrug with significant potential for treating human colorectal cancers. Further encapsulation of Pt(IV) -PW11 with DSPE-PEG2000 nanoparticles (NPs) enables targeted delivery and controlled release of inactive prodrug. Such Pt(IV) -PW11 -DSPE-PEG2000 NPs are highly efficient in inhibiting cellular growth of HT29 cells and treating human colorectal cancer in mice, superior to classic cisplatin.


RSC Advances | 2015

Effective near-infrared absorbent: ammonium tungsten bronze nanocubes

Mei Yan; Hongxi Gu; Zhouzhou Liu; Chongshen Guo; Shaoqin Liu

Hardly any other compound has realized better optical absorption of near-infrared (NIR) rays (780–2500 nm) than tungsten bronze nanoparticles in terms of absorption coefficient, widths of the working spectrum, photothermal transformation efficiency and their own physicochemical stability. However, efforts concerning the development of tungsten bronze nanoparticles for serving as a NIR absorbent are very limited due to the shortage of effective approaches to obtain these nanoparticles, especially for tungsten bronzes with insertion of bigger cations, such as CsxWO3 and (NH4)xWO3. In this work, we describe how to fabricate (NH4)xWO3 using a high-temperature but short-time solvothermal process, which involves employing oleic acid–oleylamine as the solvent and WCl6 as the W resource, together with the inspection of its NIR-absorption related properties. The nanocubes of 100 nm have been characterized by XRD, TG-MS, XPS and TEM to examine the crystal phase and nanostructures. Moreover, the dispersion of the nanocubes in the form of a thin film was used to investigate the NIR absorption properties. As determined by the optical test, the thin film consisting of the nanocubes exhibits extraordinary features as a solar control window, which can transmit the majority of visible light while absorbing nearly all of the NIR rays from 780 nm to 2500 nm. Meanwhile, the (NH4)xWO3 thin film can maintain its high shielding effect for the 1064 nm NIR light up to 35.3 kW m−2 radiation and has excellent cyclic stability for 100 cycles without obvious optical changes. Finally, it has been found that the (NH4)xWO3 nanocubes show a remarkable photothermal conversion phenomenon even when dispersed in a thin film.


New Journal of Chemistry | 2018

Hydrophobic Cu12Sb4S13-deposited photothermal film for interfacial water evaporation and thermal antibacterial activity

Chuanqi Song; Tianchan Li; Wei Guo; Yan Gao; Chunyu Yang; Qun Zhang; Di An; Mei Yan; Chongshen Guo

Hydrophobic Cu12Sb4S13 nanoparticles with strong and full-spectrum photoabsorption in the range of 200–2500 nm were fabricated and deposited on cellulose acetate (CA) membrane to form a photothermal film, which could realize photothermal heating for vapor generation and thermodestruction of pathogenic bacteria of E. coli O157:H7 simultaneously under light irradiation.


Advanced Materials | 2018

FeS2 Nanoparticles Decorated Graphene as Microbial‐Fuel‐Cell Anode Achieving High Power Density

Ruiwen Wang; Mei Yan; Huidong Li; Lu Zhang; Benqi Peng; Jinzhi Sun; Da Liu; Shaoqin Liu

Microbial fuel cells (MFCs) have received great attention worldwide due to their potential in recovering electrical energy from waste and inexhaustible biomass. Unfortunately, the difficulty of achieving the high power, especially in real samples, remains a bottleneck for their practical applications. Herein, FeS2 nanoparticles decorated graphene is fabricated via a simple hydrothermal reaction. The FeS2 nanoparticles decorated graphene anode not only benefits bacterial adhesion and enrichment of electrochemically active Geobacter species on the electrode surface but also promotes efficient extracellular electron transfer, thus giving rise to a fast start-up time of 2 d, an unprecedented power density of 3220 mW m-2 and a remarkable current density of 3.06 A m-2 in the acetate-feeding and mixed bacteria-based MFCs. Most importantly, the FeS2 nanoparticles decorated graphene anode successfully achieves a power density of 310 mW m-2 with simultaneous removal of 1319 ± 28 mg L-1 chemical oxygen demand in effluents from a beer factory wastewater. The characteristics of improved power generation and enhanced pollutant removal efficiency opens the door toward development of high-performance MFCs via rational anode design for practical application.


RSC Advances | 2017

Selective capture and rapid identification of E. coli O157:H7 by carbon nanotube multilayer biosensors and microfluidic chip-based LAMP

Tianchan Li; Fanjiao Zhu; Wei Guo; Hongxi Gu; Jing Zhao; Mei Yan; Shaoqin Liu

We describe a sensitive approach for visual and point-of-care detection of E. coli O157:H7 and its toxic gene by combining carbon nanotube (CNT) multilayer biosensors and microfluidic chip-based loop-mediated isothermal amplification (LAMP). The anti-E. coli O157:H7 functionalized CNT multilayer biosensor can selectively capture the target bacterium E. coli O157:H7 in complex samples. After culturing, the captured bacteria can be released on demand by cleavage of the anti-E. coli O157:H7 antibody–bacteria interaction. The DNA concentration of the released bacteria was subsequently analyzed with microfluidic chip-based LAMP. After systematic optimization of capturing and detecting conditions, the proposed sensing platform was capable of detecting concentrations as low as 1 CFU mL−1 without complicated instrumentation, this is much more sensitive than previous reported methods. The distinct advantages of the proposed sensing platform, such as high specificity, low cost, good reproducibility and the ability of regenerating, make it a potential platform for detecting E. coli O157:H7 in related food safety and clinical diagnosis.


New Journal of Chemistry | 2017

Urchin-like tungsten suboxide for photoacoustic imaging-guided photothermal and photodynamic cancer combination therapy

Fei Wang; Chuanqi Song; Wei Guo; Dandan Ding; Qun Zhang; Yan Gao; Mei Yan; Chongshen Guo; Shaoqin Liu

Being an encouraging approach with high selectivity and minor side-effects, imaging-guided phototherapy for cancer treatment has attracted lots of research interest. Wherein particularly important is the development of a novel agent that favors cancer imaging and phototherapy in one. In this study, urchin-like tungsten suboxide nanomaterials (WOs) were synthesized for photothermal (PT) and photodynamic (PD) combined cancer treatment, as well as photoacoustic (PA) imaging to depict tumors. On the basis of strong photoabsorption in the near-infrared (NIR) region, the WOs exhibit high photothermal conversion and singlet-oxygen generation efficiency, and thus can achieve dual effects of PT and PD therapies, resulting in severe cancer cell death and apoptosis as proved by in vitro assays. Further in vivo experiments with HeLa tumor-bearing nude mice reveal that WOs have an effective photoablation outcome for malignant tumors under 1064 nm NIR light irradiation, whereas there is no obvious systematical toxicity for major organs and no hematological disorders. Finally, WOs could also function as excellent PA agents in consideration of their rapid and significant PA signal enhancement in the tumor region. Altogether, our research work demonstrates the potential of WOs as a multifunctional nanoagent for PA imaging-guided PT and PD cancer therapy.

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Chongshen Guo

Harbin Institute of Technology

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Shaoqin Liu

Harbin Institute of Technology

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Wei Guo

Harbin Institute of Technology

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Dandan Ding

Harbin Institute of Technology

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Chuanqi Song

Harbin Institute of Technology

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Shu Yin

Jenderal Soedirman University

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Fei Wang

Harbin Institute of Technology

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Guilian Li

Harbin Institute of Technology

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Hongxi Gu

Harbin Institute of Technology

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