Electronic Supplementary Information (ESI) For

Electronic supplementary information (ESI) for

Water-dispersed carboxymethyl cellulose-montmorillonite-single walled carbon nanotube composite with sensing enhanced performance for simultaneous voltammetric determination of two trace phytohormones

Shuangshuang Lua · Ling Baia,* · Yangping Wena,b,* · Mingfang Li a· Dongdong Yana · Ran Zhanga · Kejun Chena

a Key Laboratory of Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, PR China

b Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Jiangxi Agricultural University, Nanchang 330045, China

*Corresponding author: E-mail: ; E-mail: , Fax: +86-791-83813538, Tel.: +86-791-83828158,

Fig. S1 Plot of Q-t curves for different electrodes in 5 mM [Fe(CN)6]3−/4− containing 0.1 M KCl

Fig. S2 Plots of Q-t curves for MMT/GCE in 0.1 M KCl and in 5 mM [Fe(CN)6]3−/4− containing 0.1 M KCl. Insert: plots of Q-t1/2 curves in present of 5 mM [Fe(CN)6]3−/4−(background subtracted).

Fig. S3 CVs of different modified GCE in 5 mM [Fe(CN)6]3−/4− containing 0.1 M KCl with scanning rates ranging from 20 to 200 mV s-1.

Table S1 The A for different electrodes in 5 mM [Fe(CN)6]3−/4− containing 0.1 M KCl.

Different electrodes / A (cm2) / Different electrodes / A (cm2)
bare GCE / 0.017 / CMC-MMT/GCE / 0.025
CMC/GCE / 0.019 / SWCNT-CMC/GCE / 0.076
MMT/GCE / 0.022 / SWCNT-MMT/GCE / 0.119
SWCNT/GCE / 0.06 / SWCNT-CMC-MMT/GCE / 0.15

Table S2 Regression equations and Ts of Q-t curves for different electrodes in 0.1 M PBS (pH 2.0) containing IAA (background subtracted).

Different electrodes / Regression equations / Ts (mol cm−2)
bare GCE / y = 4.475(±0.008)x -0.05445(±0.003) / 7.5× 10-11
CMC/GCE / y = 5.367(±0.006)x -0.5359(±0.002) / 1.5× 10-10
MMT/GCE / y = 6.233(±0.003)x -4.978(±0.01) / 1.2× 10-9
SWCNT/GCE / y = 88.72(±0.05)x -9.697(±0.02) / 8.4× 10-10
SWCNT-CMC-MMT/GCE / y = 157.1(±0.1)x -26.13(±0.02) / 8.9× 10-10

Table S3 Regression equations and Ts of Q-t curves for different electrodes in 0.1 M PBS (pH 2.0) containing SA (background subtracted).

Different electrodes / Regression equations / Ts (mol cm−2)
bare GCE / y = 0.1852(±0.003)x -0.02301(±0.001) / 0.7× 10-11
CMC/GCE / y = 0.5843(±0.002)x -0.08388(±0.002) / 2.3× 10-11
MMT/GCE / y = 0.6357(±0.002)x -0.5154(±0.001) / 1.2× 10-10
SWCNT/GCE / y = 11.29(±0.05)x -0.9852(±0.03) / 8.5× 10-11
SWCNT-CMC-MMT/GCE / y = 28.43(±0.08)x -2.753(±0.02) / 9.3× 10-11