TY  - EJOU
AU  - Tong, F. F. 
AU  - Han, J. L. 

TI  - Preparation of ZnS-Carbon nanotube nanocomposites via solvothermal method and their application in electrochemical detection of escherichia coli O157:H7
T2  - Chalcogenide Letters

PY  - 2025
VL  - 22
IS  - 8
SN  - 1584-8663

AB  - In this study, hierarchical ZnS–CNT hybrids were synthesized via a solvothermal reaction 
at 180 °C for 48 h, producing ∼200 nm ZnS spheres uniformly anchored onto oxidized 
multiwalled carbon nanotubes. Structural analyses by XRD confirmed the cubic sphalerite 
phase, while SEM and TEM revealed a “pearl-necklace” morphology and effective 
nanoparticle dispersion. XPS spectra verified Zn<sup>2+</sup> and oxygen-containing surface groups 
on the composite. Nitrogen adsorption–desorption measurements showed that incorporating 
CNTs transformed the material’s isotherm from type III to type IV, increasing the BET 
surface area from 68 to 155 m<sup>2</sup>
/g and introducing mesoporosity. When drop-cast onto 
screen-printed electrodes and functionalized via streptavidin–biotin chemistry, the platform 
exhibited a concentration-dependent increase in charge-transfer resistance for E. coli 
O157:H7 across 103
–108
 CFU/mL, achieving a limit of detection of ~10<sup>3</sup> 
CFU/mL within a 
30 min incubation. Specificity assays against Salmonella enteritidis, Listeria 
monocytogenes, and Staphylococcus aureus demonstrated negligible cross-reactivity. The 
rapid response, low-cost fabrication, and high surface area afforded by the mesoporous 
architecture highlight the composite’s potential for on-site, real-time pathogen screening in 
food safety and environmental monitoring applications.
KW  - Mesoporosity
KW  -  Streptavidin–biotin conjugation
KW  -  Charge-transfer resistance
KW  -  Limit of detection
KW  -  Biospecificity

DO  - 10.15251/CL.2025.228.719