NDLI: Colloidal silica beads modified with quantum dots and zinc (II) tetraphenylporphyrin for colorimetric sensing of ammonia

Content Provider	Springer Nature Link
Author	Xu, Hua Zhang, Maochun Ding, Haibo Xie, Zhuoying
Copyright Year	2012
Abstract	Colloidal crystal beads (CCBs) were fabricated by assembling monodisperse silica nanoparticles via a microfluidic device. The pore size of the CCBs was tuned by using different nanoparticles. The CCBs were then coated with cadmium telluride quantum dots and zinc(II) meso-tetraphenylporphyrin for the purpose of optical sensing. Ammonia causes the color of the sensor to change from green to red. The method has a dynamic range of 0–2500 ppm, good reversibility, and is not sensitive to humidity. The limit of detection is 7 ppm. The sensor has the advantage of a porous microcarrier structure and that pore sizes can be well controlled and thus can fulfill various demands in gas detection. Figure Figure SEM images of colloidal silica beads with different modified CCBs for colorimetric sensing of ammonia.
Starting Page	85
Ending Page	91
Page Count	7
File Format	PDF
ISSN	00263672
Journal	Microchimica Acta
Volume Number	180
Issue Number	1-2
e-ISSN	14365073
Language	English
Publisher	Springer Vienna
Publisher Date	2012-11-14
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Colloidal crystal beads Colorimetric ammonia sensing Fluorescence Porphyrin Quantum dots Nanochemistry Nanotechnology Characterization and Evaluation of Materials Analytical Chemistry Microengineering
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry

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Colloidal silica beads modified with quantum dots and zinc (II) tetraphenylporphyrin for colorimetric sensing of ammonia