石墨烯-钙钛矿结构光电化学传感器的构建及测定土壤中稀禾啶
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摘要
研究了土壤中稀禾啶在石墨烯(Gr)、钙钛矿(CH_3NH_3PbI_3)化学修饰导电玻璃(ITO)上的光电化学行为。将石墨烯分散液、钙钛矿前驱液旋涂在ITO玻璃表面制备光电化学传感器,以时间-电流法研究稀禾啶在ITO/Gr/CH_3NH_3PbI_3上的光电响应及其选择性。在pH为7.0的磷酸盐缓冲溶液,光电流值与稀禾啶的浓度在2.0×10~(-7)～2.0×10~(-5) mol·L~(-1)范围内呈良好的线性关系,检测限为8.0×10~(-9 )mol·L~(-1)。该方法具有成本低、操作方便,重复性好、灵敏度高,并可用于土壤中稀禾啶的光电化学检测。
The photoelectrochemical behavior of sethoxydim in soil on graphene(Gr),CH_3NH_3PbI_3 chemically modified conductive glass was studied.The photoelectrochemical sensor was prepared by spin-coating graphene dispersion and perovskite precursor on the surface of ITO glass.The photoelectric response and selectivity of sethoxydim on ITO/Gr/CH_3NH_3PbI_3 were studied by time-current method.In the phosphate buffer solution with pH 7.0,the photocurrent value showed a good linear relationship with the concentration of sethoxydim in the range of 2.0×10~(-7)～2.0×10~(-5 )mol·L~(-1),and the detection limit was 8.0×10~(-9) mol·L~(-1).The method has the advantages of low cost,convenient operation,good repeatability and high sensitivity,and can be used for photoelectrochemical detection of sethoxydim in soil.
The photoelectrochemical behavior of sethoxydim in soil on graphene(Gr),CH_3NH_3PbI_3 chemically modified conductive glass was studied.The photoelectrochemical sensor was prepared by spin-coating graphene dispersion and perovskite precursor on the surface of ITO glass.The photoelectric response and selectivity of sethoxydim on ITO/Gr/CH_3NH_3PbI_3 were studied by time-current method.In the phosphate buffer solution with pH 7.0,the photocurrent value showed a good linear relationship with the concentration of sethoxydim in the range of 2.0×10~(-7)～2.0×10~(-5 )mol·L~(-1),and the detection limit was 8.0×10~(-9) mol·L~(-1).The method has the advantages of low cost,convenient operation,good repeatability and high sensitivity,and can be used for photoelectrochemical detection of sethoxydim in soil.
引文
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[14]Xing G,Mathews N,Sun S,et al.Long-range balanced electron-and hole-transport lengths in organic-inorganic CH3NH3PbI3[J].Science,2013,342(6156):344-347.
[15]Liu M,Johnston M B,Snaith H J.Efficient planar heterojunction perovskite solar cells by vapour deposition[J].Nature,2013,501(7467):395-398.
[2]Pilar S E,Beatriz S M,Carmen L G,et al.Rapid photodegradation of clethodim and sethoxydim herbicides in soil and plant surface model systems[J].Arab J Chem,2016,9(5):694-703.
[3]Pilar S E,Beatriz S M,Carmen L G,et al.Identification of sethoxydim degradation products in natural waters under different light sources by HPLC-QTOF-MS[J].Microchem J,2015,119:6-10.
[4]范志先,王婵,郭宝江.甜菜作物中稀禾啶残留物的紫外吸收光谱分析[J].吉林农业大学学报,1988,2:52-54.
[5]Jin D Q,Xu Q,Yu L Y,et al.A novel sensor for the detection of acetamiprid in vegetables based on its photocatalytic degradation compound[J].Food Chem,2016,194,959–965.
[6]Devadoss A,Sudhagar P,Terashima C K,et al.Photoelectrochemical Biosensors:New Insights into Promising Photoelectrodes and Signal Amplification Strategies[J].J Photochem Photobiol C,2015,24:43-63.
[7]吕向菲,钱会,霍霄楠,等.负载型铜卟啉/TiO2/Al2O3复合膜的制备与光电催化性能研究[J].化学研究与应用,2016,28(1):107-113.
[8]Liao L,Lin Y C,Bao M Q.High-speed graphene transistors with a self-aligned nanowire gate[J].Nature,2010,467(7313):305-308.
[9]Garaj S,Hubbard W,Reina A.Graphene as a subnanometre trans-electrode membrane[J].Nature,2010,467(7312):190-193.
[10]Xing G,Mathews N,Sun S,et al.Long-range balanced electron-and hole-transport lengths in organic-inorganic CH3NH3PbI3[J].Science,2013,342(6156):344-347.
[11]Yang X C,Liu W,Ren P.All solid-state solar cells based on CH3NH3PbI3-sensitized TiO2 nanotube arrays[J].Physica E,2016,83(9):322-328.
[12]Liu M,Johnston M B,Snaith H J.Efficient planar heterojunction perovskite solar cells by vapour deposition[J].Nature,2013,501(7467):395-398.
[13]Xing G,Mathews N,Sun S,et al.Long-range balanced electron-and hole-transport lengths in organic-inorganic CH3NH3PbI3[J].Science,2013,342(6156):344-347.
[14]Xing G,Mathews N,Sun S,et al.Long-range balanced electron-and hole-transport lengths in organic-inorganic CH3NH3PbI3[J].Science,2013,342(6156):344-347.
[15]Liu M,Johnston M B,Snaith H J.Efficient planar heterojunction perovskite solar cells by vapour deposition[J].Nature,2013,501(7467):395-398.
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