scholarly journals Nanoporous fluorescent sensor based on upconversion nanoparticles for the detection of dichloromethane with high sensitivity

RSC Advances ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 565-571
Author(s):  
Haiyan Wang ◽  
Shiping Zhan ◽  
Xiaofeng Wu ◽  
Lingqiong Wu ◽  
Yunxin Liu
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Fluorescent Sensor ◽  
High Sensitivity ◽  
Anodic Alumina ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Highly Sensitive ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide

We report a highly sensitive nanoporous fluorescence sensor based on core/shell upconversion nanoparticles (UCNPs) for the detection of dichloromethane. UCNPs are deposited on porous anodic alumina oxide templates to form a thin film-like gas sensor.

scholarly journals A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7522
Author(s):  
Masanobu Matsuguchi ◽  
Tomoki Nakamae ◽  
Ryoya Fujisada ◽  
Shunsuke Shiba
Keyword(s):  
Gas Sensor ◽  
High Sensitivity ◽  
Average Diameter ◽  
Chemical Oxidation ◽  
Spherical Particles ◽  
Core Shell ◽  
Polystyrene Microsphere ◽  
In Situ Chemical Oxidation ◽  
Highly Sensitive ◽  
Dispersion Solution

A highly sensitive NH3 gas sensor based on micrometer-sized polyaniline (PANI) spheres was successfully fabricated. The PANI microspheres were prepared via a facile in situ chemical oxidation polymerization in a polystyrene microsphere dispersion solution, resulting in a core–shell structure. The sensor response increased as the diameter of the microspheres increased. The PSt@PANI(4.5) sensor, which had microspheres with a 4.5 μm average diameter, showed the largest response value of 77 for 100 ppm dry NH3 gas at 30 °C, which was 20 times that of the PANI-deposited film-based sensor. Even considering measurement error, the calculated detection limit was 46 ppb. A possible reason for why high sensitivity was achieved is simply the use of micrometer-sized PANI spherical particles. This research succeeded in providing a new and simple technology for developing a high-sensitivity NH3 gas sensor that operates at room temperature.

Ultra-high sensitivity of rhodamine B sensing based on NaGdF4:Yb3+,Er3+@NaGdF4 core-shell upconversion nanoparticles

2019 ◽  
Vol 37 (4) ◽  
pp. 339-344 ◽  
Author(s):  
Hanping Xiong ◽  
Qiuhong Min ◽  
Hongqing Ma ◽  
Lei Zhao ◽  
Wenbo Chen ◽  
...  
Keyword(s):  
Rhodamine B ◽  
High Sensitivity ◽  
Upconversion Nanoparticles ◽  
Core Shell

Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite

2008 ◽  
Vol 129 (2) ◽  
pp. 888-895 ◽  
Author(s):  
Nguyen Van Hieu ◽  
Luong Thi Bich Thuy ◽  
Nguyen Duc Chien
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Room Temperature ◽  
Highly Sensitive

Bioinspired enamel-like oriented minerals on general surfaces: towards improved mechanical properties

2019 ◽  
Vol 7 (34) ◽  
pp. 5237-5244 ◽  
Author(s):  
Zhuoxin Chen ◽  
Zhangshu Miao ◽  
Pan Zhang ◽  
Hong Xiao ◽  
Huan Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Anodic Alumina ◽  
System P ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide ◽  
Gel System

Enamel-like oriented hydroxyapatite minerals were obtained on general surfaces by a biomimetic, anodic alumina oxide (AAO)-assisted, double-layered gel system.

Synthesis and Optical Properties of Metal Nanoparticles Embedded in Porous Anodic Alumina Oxide

2005 ◽  
Vol 475-479 ◽  
pp. 4093-4096
Author(s):  
Rui Long Zong ◽  
Ji Zhou ◽  
Shi Kao Shi ◽  
Long Tu Li
Keyword(s):  
Metal Nanoparticles ◽  
Metallic Nanoparticles ◽  
Composite Films ◽  
Alternate Current ◽  
Electrochemical Process ◽  
Anodic Alumina ◽  
Noble Metal Nanoparticles ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide ◽  
Transparent Composite

We have improved an electrochemical process in which the alternate current (AC) electrodeposition combined with the etching of substrate to prepare transparent metallic nanoparticles and anodic alumina oxide (AAO) composite films. The new process greatly simplifies the direct current (DC) electrodeposition process to get transparent composite films. Moreover, the electrocrystallization mechanism has been analyzed. The Ag, Cu and Ag-Cu co-deposited nanoparticles/AAO films have distinct absorption peaks, which can be ascribed to the surface plasmon resonance (SPR) of these noble metal nanoparticles.

Fabrication of highly sensitive and selective H 2 gas sensor based on SnO 2 thin film sensitized with microsized Pd islands

2016 ◽  
Vol 301 ◽  
pp. 433-442 ◽  
Author(s):  
Nguyen Van Toan ◽  
Nguyen Viet Chien ◽  
Nguyen Van Duy ◽  
Hoang Si Hong ◽  
Hugo Nguyen ◽  
...  
Keyword(s):  
Thin Film ◽  
Gas Sensor ◽  
Highly Sensitive

Anodic Alumina Oxide Template with Branched Structure Formed in Phosphoric Acid

2008 ◽  
Vol 373-374 ◽  
pp. 252-255 ◽  
Author(s):  
Hui Wang ◽  
H.W. Wang ◽  
P. Zeng
Keyword(s):  
Phosphoric Acid ◽  
Current Density ◽  
Anodic Alumina ◽  
Large Size ◽  
Atomic Force ◽  
Initial Stage ◽  
Anodic Alumina Oxide ◽  
Alumina Oxide ◽  
Order Degree ◽  
Branched Structure

Anodic alumina oxide (AAO) templates with multi-branched structure were fabricated in a phosphoric acid. Atomic force microscope (AFM) was utilized to investigate the unstable growth of porous oxide film in initial stage. The morphologies of cross-section of AAO templates at different current density were also studied with FESEM. The results show that the acquired AAO templates are of multi-branched structure with large size. The diameter of pores on outer surface ranges from 150 to 220 nm, and the width of branches from 100-120 nm. This structure can be due to the unstable growth of AAO film in initial stage. Besides, the structure of AAO template is sensitive to the current density and the order degree decreases with the increase of current density: at 1.0A/dm2, most of tubes are not straight and some divided into two branches; at 2.0A/dm2, all tubes grow disorderly and form net-like structure. In this electrolyte, different types of structure of AAO templates can be acquired by adjusting current density, which may be used for the synthesis of new types of nanowires with improved mechanical properties.

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