TY - JOUR
T1 - Ultrasmall metal-organic framework zn-mof-74 nanodots
T2 - Size-controlled synthesis and application for highly selective colorimetric sensing of iron(III) in Aqueous Solution
AU - Wang, Jiuhai
AU - Fan, Yadi
AU - Lee, Hang Wei
AU - Yi, Changqing
AU - Cheng, Changming
AU - Zhao, Xin
AU - Yang, Mo
PY - 2018/7/27
Y1 - 2018/7/27
N2 - Here, a novel colorimetric sensing platform for highly selective detection of Fe3+ in aqueous solutions was developed based on zero-dimensional Zn-MOF-74 [Zn2(DOBDC), DOBDC = 2,5-dihydroxyterephthalic acid] nanodots. The first ultrasmall Zn-MOF-74 nanodots with the average size within 10 nm were successfully synthesized by manipulating the initial conditions with a diluted material system. It was found that the ultrasamll MOF nanodots had a highly selective interaction with Fe3+ and showed a specific blue colorimetric change in aqueous solution. The highly dispersive nature in aqueous solution and high surface-to-volume ratio help MOF-74 nanodots closely interact with the targeted Fe3+ ions with a low limit of detection of 1.04 μM and a fast response within seconds. Finally, we demonstrate that the selective Fe3+ sensing mechanism of Zn-MOF-74 nanodots is due to the selective framework disruption and the formation of Fe-DOBDC salt complex with blue color. It is the first report of nanoscale MOF based colorimetric Fe3+ sensor with low limit of detection (LOD) comparable even to fluorescent MOF based Fe3+ sensors, which could be easily observed by naked-eye without expensive fluorescence apparatuses. The good colorimetric stability in aqueous environment, low limit of detection, rapid response, and nanosize nature enable this MOF nanodot to be a good Fe3+ sensing probe for biological and environmental sensing applications.
AB - Here, a novel colorimetric sensing platform for highly selective detection of Fe3+ in aqueous solutions was developed based on zero-dimensional Zn-MOF-74 [Zn2(DOBDC), DOBDC = 2,5-dihydroxyterephthalic acid] nanodots. The first ultrasmall Zn-MOF-74 nanodots with the average size within 10 nm were successfully synthesized by manipulating the initial conditions with a diluted material system. It was found that the ultrasamll MOF nanodots had a highly selective interaction with Fe3+ and showed a specific blue colorimetric change in aqueous solution. The highly dispersive nature in aqueous solution and high surface-to-volume ratio help MOF-74 nanodots closely interact with the targeted Fe3+ ions with a low limit of detection of 1.04 μM and a fast response within seconds. Finally, we demonstrate that the selective Fe3+ sensing mechanism of Zn-MOF-74 nanodots is due to the selective framework disruption and the formation of Fe-DOBDC salt complex with blue color. It is the first report of nanoscale MOF based colorimetric Fe3+ sensor with low limit of detection (LOD) comparable even to fluorescent MOF based Fe3+ sensors, which could be easily observed by naked-eye without expensive fluorescence apparatuses. The good colorimetric stability in aqueous environment, low limit of detection, rapid response, and nanosize nature enable this MOF nanodot to be a good Fe3+ sensing probe for biological and environmental sensing applications.
KW - colorimetric sensing
KW - metal ion detection
KW - metal-organic framework
KW - nanodot
KW - zero-dimensional
UR - http://www.scopus.com/inward/record.url?scp=85056076224&partnerID=8YFLogxK
U2 - 10.1021/acsanm.8b01083
DO - 10.1021/acsanm.8b01083
M3 - Journal article
AN - SCOPUS:85056076224
VL - 1
SP - 3747
EP - 3753
JO - ACS Applied Nano Materials
JF - ACS Applied Nano Materials
SN - 2574-0970
IS - 7
ER -