Accepted Manuscript Title: Silver nanoplates-based colorimetric iodide recognition and sensing using sodium thiosulfate as a sensitizer Author: Xinyan Hou Shu Chen Jian Tang Yuan Xiong Yunfei Long PII: DOI: Reference:
S0003-2670(14)00374-2 http://dx.doi.org/doi:10.1016/j.aca.2014.03.038 ACA 233175
To appear in:
Analytica Chimica Acta
Received date: Revised date: Accepted date:
4-2-2014 24-3-2014 26-3-2014
Please cite this article as: Xinyan Hou, Shu Chen, Jian Tang, Yuan Xiong, Yunfei Long, Silver nanoplates-based colorimetric iodide recognition and sensing using sodium thiosulfate as a sensitizer, Analytica Chimica Acta http://dx.doi.org/10.1016/j.aca.2014.03.038 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Silver nanoplates-based colorimetric iodide recognition and sensing using sodium thiosulfate as a sensitizer
ip t
Xinyan Hou, Shu Chen*, Jian Tang, Yuan Xiong, Yunfei Long
Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of
cr
Education of China, School of Chemistry and Chemical Engineering, Hunan University
us
of Science and Technology, Xiangtan, 411201, China.
Corresponding author. Tel.: +86 731 58388503; fax: +86 731 58372324
an
E-mail: [email protected] (to Y. Long), [email protected] (to S. Chen) .
M
Highlights
Abstract
ce pt
ed
► 1. A new colorimetric iodide detection strategy based on triangular Ag nanoplate. ► 2. Sodium thiosulfate performed as a sensitizer. ► 3. Formation of insoluble AgI on the surface of Ag nanoplate. ► 4. This method has the advantages of good selectivity and high sensitivity.
A colorimetric method for the recognition and sensing of iodide ions (I−) has been developed by utilizing the reactions between triangular silver nanoplates (TAg-NPs)
Ac
and I− in the presence of sodium thiosulfate (Na2S2O3). Specifically, I− together with Na2S2O3 can induce protection of TAg-NPs owing to the formation of insoluble AgI, as confirmed by the high-resolution transmission electron microscopy (HRTEM). In the absence of Na2S2O3, the etching reactions on TAg-NPs were observed not only by I− but also other halides ions. The Na2S2O3 plays as a sensitizer in this system, which improved the selectivity and sensitivity. The desired colorimetric detection can be achieved by measuring the change of the absorption peak wavelength corresponding to
.
Page 1 of 16
localized surface plasmon resonance (LSPR) with UV-vis spectrophotometer or recognized by naked eye observation. The results show that the shift of the maximum absorption wavelength () of the TAg-NPs/Na2S2O3/I- mixture was proportional to the concentration of I− in the range 1.0 109 to 1.0 106 mol/L. Moreover, no other ions besides I− can induce an eye discernible color change as low as 1.0 107 mol/L.
cr
ip t
Finally, this method was successfully applied for I− determination in kelp samples.
Keywords: Triangular silver nanoplates; Iodide ions; Sodium thiosulfate; Colorimetric
us
detection.
an
1. Introduction
Silver nanostructures with different size and shape possess unique and tunable
M
optical properties[1]. Well-defined structure includes nanocubes[2], nanodisks/ nanoplates[3,4], nanoprisms[5], nanorods[6], nanowires[7], nanobelts[8], and
ed
branched nanocrystals[9]. Their fascinating surface plasmon features can be used for optical label[10], surface-enhanced Raman scattering (SERS)[11], chemical and
ce pt
biological sensing[12]. Among these structures, triangular silver naoplates (TAg-NPs) have attracted particular attention over the past decade due to their outstanding plasmonic features across visible-NIR regions. They exhibit intense and tunable localized surface plasmon resonance (LSPR) by controlling its ratio of edge length to
Ac
thickness and the truncation degree of tips, which is not available for spherical Ag nanoparticles. Moreover, the LSRP induced unique colors ranging from yellow to blue have been attempted as chromogenic probes in colorimetric sensing and visual detection[13,14]. Iodide is an essential micronutrient for neurological activity and thyroid gland function of normal human beings[15]. Either the deficiency or abundance of iodide can lead to thyroid disease. Inadequate iodide in human body is detrimental to the thyroid and long-term deficiency may lead to goiter (thyroid atrophy). On the contrary, an
Page 2 of 16
excess of iodides can block the thyroid’s ability to produce the hormones, thyroxine and triiodothyronine, which control many metabolic activities in the human body[16]. The range of iodide demand in the human body has been studied by the Deutsche Gesellschaft fur Ernahrung (German Society of Nutrition), which suggests daily dietary
ip t
allowance of iodide of 40-80 µg for infants, 100-200 µg for children and adults, and up to 260 µg for nursing mothers[17]. Iodide quite rarely exists in foods and environment, even sea water contains a very low iodide concentration (
S0003-2670(14)00374-2 http://dx.doi.org/doi:10.1016/j.aca.2014.03.038 ACA 233175
To appear in:
Analytica Chimica Acta
Received date: Revised date: Accepted date:
4-2-2014 24-3-2014 26-3-2014
Please cite this article as: Xinyan Hou, Shu Chen, Jian Tang, Yuan Xiong, Yunfei Long, Silver nanoplates-based colorimetric iodide recognition and sensing using sodium thiosulfate as a sensitizer, Analytica Chimica Acta http://dx.doi.org/10.1016/j.aca.2014.03.038 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Silver nanoplates-based colorimetric iodide recognition and sensing using sodium thiosulfate as a sensitizer
ip t
Xinyan Hou, Shu Chen*, Jian Tang, Yuan Xiong, Yunfei Long
Key Laboratory of Theoretical Chemistry and Molecular Simulation of Ministry of
cr
Education of China, School of Chemistry and Chemical Engineering, Hunan University
us
of Science and Technology, Xiangtan, 411201, China.
Corresponding author. Tel.: +86 731 58388503; fax: +86 731 58372324
an
E-mail: [email protected] (to Y. Long), [email protected] (to S. Chen) .
M
Highlights
Abstract
ce pt
ed
► 1. A new colorimetric iodide detection strategy based on triangular Ag nanoplate. ► 2. Sodium thiosulfate performed as a sensitizer. ► 3. Formation of insoluble AgI on the surface of Ag nanoplate. ► 4. This method has the advantages of good selectivity and high sensitivity.
A colorimetric method for the recognition and sensing of iodide ions (I−) has been developed by utilizing the reactions between triangular silver nanoplates (TAg-NPs)
Ac
and I− in the presence of sodium thiosulfate (Na2S2O3). Specifically, I− together with Na2S2O3 can induce protection of TAg-NPs owing to the formation of insoluble AgI, as confirmed by the high-resolution transmission electron microscopy (HRTEM). In the absence of Na2S2O3, the etching reactions on TAg-NPs were observed not only by I− but also other halides ions. The Na2S2O3 plays as a sensitizer in this system, which improved the selectivity and sensitivity. The desired colorimetric detection can be achieved by measuring the change of the absorption peak wavelength corresponding to
.
Page 1 of 16
localized surface plasmon resonance (LSPR) with UV-vis spectrophotometer or recognized by naked eye observation. The results show that the shift of the maximum absorption wavelength () of the TAg-NPs/Na2S2O3/I- mixture was proportional to the concentration of I− in the range 1.0 109 to 1.0 106 mol/L. Moreover, no other ions besides I− can induce an eye discernible color change as low as 1.0 107 mol/L.
cr
ip t
Finally, this method was successfully applied for I− determination in kelp samples.
Keywords: Triangular silver nanoplates; Iodide ions; Sodium thiosulfate; Colorimetric
us
detection.
an
1. Introduction
Silver nanostructures with different size and shape possess unique and tunable
M
optical properties[1]. Well-defined structure includes nanocubes[2], nanodisks/ nanoplates[3,4], nanoprisms[5], nanorods[6], nanowires[7], nanobelts[8], and
ed
branched nanocrystals[9]. Their fascinating surface plasmon features can be used for optical label[10], surface-enhanced Raman scattering (SERS)[11], chemical and
ce pt
biological sensing[12]. Among these structures, triangular silver naoplates (TAg-NPs) have attracted particular attention over the past decade due to their outstanding plasmonic features across visible-NIR regions. They exhibit intense and tunable localized surface plasmon resonance (LSPR) by controlling its ratio of edge length to
Ac
thickness and the truncation degree of tips, which is not available for spherical Ag nanoparticles. Moreover, the LSRP induced unique colors ranging from yellow to blue have been attempted as chromogenic probes in colorimetric sensing and visual detection[13,14]. Iodide is an essential micronutrient for neurological activity and thyroid gland function of normal human beings[15]. Either the deficiency or abundance of iodide can lead to thyroid disease. Inadequate iodide in human body is detrimental to the thyroid and long-term deficiency may lead to goiter (thyroid atrophy). On the contrary, an
Page 2 of 16
excess of iodides can block the thyroid’s ability to produce the hormones, thyroxine and triiodothyronine, which control many metabolic activities in the human body[16]. The range of iodide demand in the human body has been studied by the Deutsche Gesellschaft fur Ernahrung (German Society of Nutrition), which suggests daily dietary
ip t
allowance of iodide of 40-80 µg for infants, 100-200 µg for children and adults, and up to 260 µg for nursing mothers[17]. Iodide quite rarely exists in foods and environment, even sea water contains a very low iodide concentration (
