Visible photoelectrochemical sensing platform by in situ generated CdS quantum dots decorated branched-TiO2nanorods equipped with Prussian blue electrochromic display.
In this study, based on in situ generation of CdS quantum dots (QDs) on the surface of branched TiO2(B-TiO2) nanorods, an solar innovative photoelectrochemical (PEC) sensing platform was constructed for real-time, and sensitive detection of cellular H2S. Specifically, B-TiO2nanorods arrays consisting of TiO2nanorods directly grown on fluorine-doped tin oxide (FTO) further using TiCl3mediated surface treatment of TiO2nanorods are designed and fabricated as a new type of photoelectrode. CdS quantum dots (QDs) was formed on the surface of B-TiO2nanorods arrays through the reaction between Cd2+and S2-. And a significant enhancement in the photocurrent was obtained that ascribed to the formation of CdS-B-TiO2heterostructures, thus leading to sensitive PEC recording of the H2S level in buffer and cellular environments. By using Prussian blue (PB) a electrochromic material to capture the photoelectron generated from the photoelectrode, a new visual system was proposed due to the formation of Prussian white (PW), which could be used to visualize the quantum photoelectric effect. This novel PEC sensing platform not only achieved satisfied analysis results toward S2-, but also showed excellent sensitivity, selectivity, low cost, and portable features. The strategy through the in situ generation of semiconductor nanoparticles on the surface of wide band-gap semiconductor paves the way for the improvements of PEC analytical performance. Meanwhile, the quantitative read-out electrochromic display paves a facile avenue and initiates new opportunities for creation of cheap, miniaturization sensors for other relevant analytes.
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
Yanhu
Y
Wang
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
Shenguang
S
Ge
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China.
Lina
L
Zhang
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: ujn.yujh@gmail.com.
Jinghua
J
Yu
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
Mei
M
Yan
School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China; College of Biological Sciences and Technology, University of Jinan, Jinan 250022, PR China.
Jiadong
J
Huang
D015374:Biosensing Techniques; D019187:Cadmium Compounds / Q000737:chemistry / Q000302:isolation & purification*; D055664:Electrochemical Techniques; D005295:Ferrocyanides / Q000737:chemistry; D057230:Limit of Detection; D043942:Nanotubes / Q000737:chemistry; D045663:Quantum Dots / Q000737:chemistry; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry / Q000302:isolation & purification*; D017971:Tin Compounds / Q000737:chemistry
D019187:Cadmium Compounds; D005295:Ferrocyanides; D013440:Sulfides; D017971:Tin Compounds; C034939:cadmium sulfide; C045358:stannic oxide; C000170:ferric ferrocyanide
B-TiO(2) nanorod arrays, CdS QDs; Photoelectrochemical; Prussian blue, electrochromic, H(2)S