A colorimetric method for highly sensitive and accurate detection of iodide by finding the critical color in a color change process using silver triangular nanoplates.
In this contribution, we demonstrated a novel colorimetric method for highly sensitive and accurate detection of iodide using citrate-stabilized silver triangular nanoplates (silver TNPs). Very lower concentration of iodide can induce an appreciable color change of silver TNPs solution from blue to yellow by fusing of silver TNPs to nanoparticles, as confirmed by UV-vis absorption spectroscopy and transmission electron microscopy (TEM). The principle of this colorimetric assay is not an ordinary colorimetry, but a new colorimetric strategy by finding the critical color in a color change process. With this strategy, 0.1 μM of iodide can be recognized within 30 min by naked-eyes observation, and lower concentration of iodide down to 8.8 nM can be detected using a spectrophotometer. Furthermore, this high sensitive colorimetric assay has good accuracy, stability and reproducibility comparing with other ordinary colorimetry. We believe this new colorimetric method will open up a fresh insight of simple, rapid and reliable detection of iodide and can find its future application in the biochemical analysis or clinical diagnosis.
Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, PR China.
Xiu-Hua
XH
Yang
Jian
J
Ling
Jun
J
Peng
Qiu-E
QE
Cao
Zhong-Tao
ZT
Ding
Long-Chun
LC
Bian
D019343:Citric Acid / Q000737:chemistry; D003116:Color; D006863:Hydrogen-Ion Concentration; D007454:Iodides / Q000032:analysis*; D053768:Metal Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
D007454:Iodides; D019343:Citric Acid; D012834:Silver
Colorimetric analysis; Iodide detection; Shape transformation; Silver triangular nanoplates