Search query: Preparation of three-dimensional ordered macroporous materials

Related papers:

abstract: The development of a high performance semiconductor oxide sensor for the accurate detection of trace disease biomarkers in exhaled breath is still a challenge that urgently needs to be addressed. Here, we proposed a self assembly strategy and spin coating process to create a graphene quantum dot (GQD) functionalized three dimensional ordered macroporous (3DOM) ZnO structure. The strong synergistic effect and the p n heterojunction between the p type GQDs and n type ZnO effectively enlarged the resistance variation due to the change in oxygen adsorption. The specific 3DOM structure induced a hierarchical pore size (286 nm in macroscale and 26 nm in mesoscale) and 3D interconnection, which guaranteed high gas accessibility and fast carrier transportation. As a result, the GQD modified 3DOM ZnO sensor exhibited a remarkably high response (Rair/Rgas 15.2 for 1 ppm acetone) rapid response/recovery time (9/16 s) extremely low theoretical detection limit (8.7 ppb) and good selectivity towards acetone against other interfering gases. In particular, the proposed sensor could accurately distinguish trace acetone in the simulated breath of diabetic patients. These results demonstrate a high potential for the feasibility of the GQD modified 3DOM SMO structure as a new sensing material for the possibility of noninvasive real time diagnosis of diabetes.
author_names: Wei-li Liu

Xiangyu Zhou

Lin Xu

Shidong Zhu

Shuo-Wang Yang

Xinfu Chen

Biao Dong

Xue Bai

Geyu Lu

Hongwei Song
title: Graphene quantum dot functionalized three dimensional ordered mesoporous ZnO for acetone detection toward diagnosis of diabetes.
venue: Nanoscale
year: 2019

abstract: Abstract Three dimensional (3D) long range well ordered macroporous SiCN ceramics were prepared by infiltrating sacrificial colloidal silica templates with the low molecular weight preceramic polymer, polysilazane. This was followed by a thermal curing step, pyrolysis at 1250 degC in a N2 atmosphere, and finally the removal of the templates by etching with dilute HF. The produced macroporous SiCN ceramics showed high BET surface areas (pore volume) in the range 455 m2/g (0.31 cm3/g) 250 m2/g (0.16 cm3/g) with the pore sizes of 98 578 nm, which could be tailored by controlling the sizes of the sacrificial silica spheres in the range 112 650 nm. The sphere inversed macropores were interconnected by 50 30 nm windows and 3 5 nm mesopores embedded in the porous SiCN ceramic frameworks, which resulted in a trimodal pore size distribution. The surface of the achieved porous SiCN ceramic was then modified by Pt Ru nanoparticle depositing under mild chemical conditions.
author_names: Hao Wang

Shuang-yang Zheng

Xiaodong Li

Dong-Pyo Kim
title: Preparation of three dimensional ordered macroporous SiCN ceramic using sacrificing template method
year: 2005

abstract: Abstract A series of phosphotungstic acid (HPW)/TiO2 materials with three dimensional continuous and ordered macroporous structure, ranging from 130 nm to 300 nm in size, are synthesized by colloidal crystal templates and used as catalysts for oxidative desulfurization (ODS) of model oil. The structure and properties of 3DOM HPW/TiO2 catalysts are characterized by powder X ray diffraction (XRD) scanning electron microscope (SEM) transmission electron microscopy (TEM) N2 adsorption desorption isotherms, inductively coupled plasma optical emission spectrophotometer (ICP) and fourier transform infrared spectra (FT IR) Characterization results demonstrate that all the HPW/TiO2 samples possess a large BET surface area and three dimensional ordered macroporous structure with Keggin type HPW dispersed homogeneously in TiO2 framework. 3DOM HPW/TiO2 with an average pore diameter around 250 nm presents the highest catalytic activity for dibenzothiophene (DBT) which can be attributed to the combination of its large enough macropores allowing for efficient mass transport and its high surface area enabling sufficient exposure of catalytic active sites. Furthermore, the catalyst is recovered and reused for seven runs with no obviously decrease in catalytic activity.
author_names: Du Yue

Jiaheng Lei

Yang Peng

Junsheng Li

Xiaodi Du
title: Three dimensional ordered phosphotungstic acid/TiO2 with superior catalytic activity for oxidative desulfurization
year: 2018

abstract: Ordered 3D interconnected macroporous Prussian blue (PB) films were electrochemically fabricated by using colloidal crystals of polystyrene beads as sacrificial templates. The prepared PB film electrodes have excellent catalytic activity towards the reduction of hydrogen peroxide. The PB structure was further used as functional interface for fabricating an enzyme based glucose sensor by using surface modification technique based on the electrostatic interactions. The resulted sensor has higher functional density, and larger surface area. The interconnected macroporous structure allows enhanced mass transport. These characteristics of the sensor enable us to detect glucose with high sensitivity. Therefore, the present 3D ordered macroporous film sensor exhibits wide linear detection range towards glucose, acceptable reproducibility and operational and storage stability. The present approach is promising for the generation of high enzyme content thin films with tailored bioactivity.
author_names: Jian-Ding Qiu

Hongzhen Peng

Ruping Liang

Meng Xiong
title: Preparation of Three Dimensional Ordered Macroporous Prussian Blue Film Electrode for Glucose Biosensor Application
year: 2007

abstract: Abstract Three dimensionally ordered macroporous (3DOM) perovskite materials have attracted the interest from researchers worldwide due to their unique macroporous structure, flexible composition, tailorable physicochemical property, high stability and biocompatibility. In particular, they were widely used in environmental field, such as photocatalysis, catalytic combustion, catalytic oxidation and sensors. In this review, the recent progresses in the synthesis of 3DOM perovskite materials and their environmental applications are summarized. The advantages and the promoting mechanisms of 3DOM perovskite materials for different applications are discussed in detail. Subsequently, the challenges and perspectives on the topic are proposed.
author_names: Chenxi Zhang
title: Three dimensionally ordered macroporous perovskite materials for environmental applications
venue: Chinese Journal of Catalysis
year: 2019

abstract: Abstract Binary metal oxides are considered as promising electrode materials due to the higher electrochemical activity than mono metal oxides. However, the poor conductivity and aggregation of binary metal oxides impede ion and electron transport kinetics, which deteriorates their electrochemical performances. Herein, we design and fabricate three dimensional ordered macroporous NiFe 2 O 4 on carbon yarn, in which a core of carbon yarn is covered with the sheath of three dimensional ordered macroporous NiFe 2 O 4 The three dimensional ordered macroporous structure is feature with abundant transportation shortcuts for electrolyte ions and excellent structural stability, thus offering great advantages for efficient fibriform supercapacitor. The fibriform supercapacitor is further assembled using two intertwined three dimensional ordered macroporous NiFe 2 O 4 carbon yarn electrodes, both of which are solidified in the KOH polyvinyl alcohol gel electrolyte. The assembled fibriform supercapacitor exhibits high specific capacitance (247 mF cm 1 at scan rate of 10 mV s 1 and robust cycling stability (96% capacitance retention after 8000 cycles) Furthermore, the fibriform supercapacitor shows substantial mechanical flexibility with minor capacitance decrease upon continuous bending cycles, and the knitted fibriform supercapacitor exhibits the excellent wearability and integration. Thus, the as prepared fibriform supercapacitor shows great promise as the energy storage unit for wearable electronics.
author_names: Peng Zhao

Xingke Ye

Yucan Zhu

Hedong Jiang

Lingling Wang

Ziyu Yue

Zhongquan Wan

Chunyang Jia
title: Three dimensional ordered macroporous NiFe2O4 coated carbon yarn for knittable fibriform supercapacitor
year: 2018

abstract: Nanosized 58S bioactive glass (BG) particles were synthesized by using a three dimensional ordered macroporous carbon template (OMC) with a pore size of 400nm. The obtained 58S BG particles possessed a diameter of 300nm, narrow size distribution and uniform spherical morphology. 58S/gelatin composites were prepared and showed much better mechanical properties than pure gelatin. The narrow size distribution of the 58S particles replicated from OMC was confirmed crucial to the mechanical properties of the 58S/gelatin composite, comparing to the contrast sample prepared with polydispersed particles. The outstanding bioactivity of the 58S BG particles was confirmed by inducing the formation of carbonated hydroxyapatite on the 58S/gelatin composite surface. This work showed a successful example that OMC template could be used to synthesize particles requiring a robust reaction condition, and a particle synthesis method that could well control particle size distribution was important for preparing materials with outstanding mechanical properties.
author_names: Lijun Ji

Wei Qiao

Kai-Wei Huang

Yuheng Zhang

Huayu Wu

Shiyong Miao

Hongfei Liu

Yixiang Dong

Aiping Zhu

Dong Qiu
title: Synthesis of nanosized 58S bioactive glass particles by a three dimensional ordered macroporous carbon template.
venue: Materials science engineering. C, Materials for biological applications
year: 2017

abstract: Abstract Three dimensional ordered macroporous (3DOM) Er 3+ Yb 3+ co doped CeO 2 and powder samples were prepared. The phase of the 3DOM sample was confirmed by XRD, and upconversion (UC) luminescence property was investigated. The results showed that green (527 nm, 548 nm) and red (659 nm) emission bands were observed in the 3DOM and powder samples under a 980 nm excitation at room temperature. It is interesting that the relative intensity of the red to green emission in the 3DOM sample increased in comparison with that of powder sample due to the increased non radiative relaxation from 4 I 11/2 to 4 I 13/2 state in the 3DOM materials.
author_names: Hangjun Wu

Zhengwen Yang

Jiayan Liao

Shenfeng Lai

Jianbei Qiu

Zhi-guo Song

Yong Yang

Dacheng Zhou

Zhaoyi Yin
title: Upconversion luminescence properties of three dimensional ordered macroporous CeO2: Er3+ Yb3+
year: 2014

abstract: Abstract A novel three dimensional ordered macroporous (3DOM) Cu/Fe 3 O 4 composite film was prepared by electrodepositing ferroferric oxide (Fe 3 O 4 on the 3DOM Cu current collector. Characterizations via electron microscopies and X ray diffractions confirmed that achieved 3DOM Cu/Fe 3 O 4 composite inherited originally ordered porous structure, but has a layer of nanosized Fe 3 O 4 on the surface of the 3DOM Cu framework. The obtained 3DOM Cu/Fe 3 O 4 composite films were directly used as anodes of lithium ion batteries in the absence of conducting additives or binders. Results from electrochemical evaluations exhibited that the 3DOM Cu/Fe 3 O 4 anode could deliver a stable capacity of 800 mAh g 1 up to 400 cycles, while fast capacity degradation with 200 mAh g 1 retained after 100 cycles was observed on Fe 3 O 4 deposited on plane Cu substrate. The superior behavior of the 3DOM Cu/Fe 3 O 4 composite anode is ascribed to its unique porous structure, which provides sufficient space for large volume change of Fe 3 O 4 and greatly reduces the diffusion distance for Li ion in the active material.
author_names: Yi-Ping Tang

Huang Zhang

Jiquan Li

Guangya Hou

Hua-zhen Cao

Lian-Kui Wu

Guo-qu Zheng

Qingliu Wu
title: Three dimensional ordered macroporous Cu/Fe3O4 composite as binder free anode for lithium ion batteries
year: 2017

abstract: Abstract Three dimensionally ordered macroporous (3DOM) CeO2, 3DOM Cr2O3, 3DOM xCr2O3 CeO2 (x (the weight percentage of Cr2O3) 3.5, 5.5, and 8.0 wt% and 5.5 wt% Cr2O3/3DOM CeO2 samples were prepared using the polymethyl methacrylate (PMMA) templating and incipient wetness impregnation methods, respectively. A number of techniques were used to characterize physicochemical properties of the materials, and their catalytic activities were evaluated for the oxidation of trichloroethylene (TCE) These samples possessed a good quality 3DOM structure and a surface area of 35 47 m2/g. The 3DOM 5.5Cr2O3 CeO2 sample performed the best (the temperature at TCE conversion 90% 255 degC at a space velocity of 20,000 mL/(g h) Effects of water vapor and carbon dioxide on activity of the 5.5Cr2O3 CeO2 sample were also examined. It is observed that partial deactivation induced by H2O introduction of the 5.5Cr2O3 CeO2 sample was reversible, while that induced by CO2 addition was irreversible. Based on the activity data and characterization results, it is concluded that the good catalytic activity and thermal stability of 3DOM 5.5Cr2O3 CeO2 was associated with its high adsorbed oxygen species concentration, good low temperature reducibility, and strong interaction between Cr2O3 and CeO2. We believe that the 3DOM 5.5Cr2O3 CeO2 catalyst is promising in the application for oxidative removal of chlorinated volatile organic compounds.
author_names: Xing Zhang

Yuxi Liu

Jiguang Deng

Xingtian Zhao

Kunfeng Zhang

Jun Yang

Zhuo Han

Xiyun Jiang

Hongxing Dai
title: Three dimensionally ordered macroporous Cr2O3 CeO2: High performance catalysts for the oxidative removal of trichloroethylene
year: 2020