The rational design of robust photoactive material and artful sensing strategy are vital for the construction of an ultrasensitive photoelectrochemical(PEC)sensor.Although great progress has been made in PEC sensing,t...The rational design of robust photoactive material and artful sensing strategy are vital for the construction of an ultrasensitive photoelectrochemical(PEC)sensor.Although great progress has been made in PEC sensing,the resultant detection performances and adoptable sensing strategies are still limited.Herein,through the design of a subtle component reconstitution strategy,an ultrasensitive PEC sensor is developed for the detection of Cu2+based on advanced CuS/CdS nanohybrids(NHs).This proposed sensor shows superior sensing performances with a low detection limit of 0.1 nM and a wide detection range from 0.2 nM to 60 pM due to the formation of p-n junction between CuS and CdS and the component transformation of CdS to CuxS(x=1,2).Moreover,such PEC sensor also displays goodish results for monitoring the Cu^2+released from apoptotic HeLa cells in vitro.This idea of component reconstitution provides a new paradigm for the design of advanced PEC sensors.展开更多
Nano-particles of cadmium sulphide were deposited on cleaned copper substrate by an automated se- quential ionic layer adsorption reaction （SILAR） system. The grown nano-bulk junction exhibits Schottky diode behavio...Nano-particles of cadmium sulphide were deposited on cleaned copper substrate by an automated se- quential ionic layer adsorption reaction （SILAR） system. The grown nano-bulk junction exhibits Schottky diode behavior. The response of the nano-bulk junction was investigated under oxygen and hydrogen atmospheric condi- tions. The gas response ratio was found to be 198% for Oxygen and 34% for Hydrogen at room temperature. An increase in the operating temperature of the nano-bulk junction resulted in a decrease in their gas response ratio. A logarithmic dependence on the oxygen partial pressure to the junction response was observed, indicating a Temkin isothermal behavior. Work function measurements using a Kelvin probe demonstrate that the exposure to an oxy- gen atmosphere fails to effectively separate the charges due to the built-in electric field at the interface. Based on the benefits like simple structure, ease of fabrication and response ratio the studied device is a promising candidate for gas detection applications.展开更多
基金supported by the National Natural Science Foundation of China (21625502)Priority Academic Program Development and Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX18,1188)
文摘The rational design of robust photoactive material and artful sensing strategy are vital for the construction of an ultrasensitive photoelectrochemical(PEC)sensor.Although great progress has been made in PEC sensing,the resultant detection performances and adoptable sensing strategies are still limited.Herein,through the design of a subtle component reconstitution strategy,an ultrasensitive PEC sensor is developed for the detection of Cu2+based on advanced CuS/CdS nanohybrids(NHs).This proposed sensor shows superior sensing performances with a low detection limit of 0.1 nM and a wide detection range from 0.2 nM to 60 pM due to the formation of p-n junction between CuS and CdS and the component transformation of CdS to CuxS(x=1,2).Moreover,such PEC sensor also displays goodish results for monitoring the Cu^2+released from apoptotic HeLa cells in vitro.This idea of component reconstitution provides a new paradigm for the design of advanced PEC sensors.
基金SERB and KSCSTE for the financial support provided to carry out this work vide SB/FTP/PS-013/2013 and 006/SRSPS/2014/ CSTE
文摘Nano-particles of cadmium sulphide were deposited on cleaned copper substrate by an automated se- quential ionic layer adsorption reaction （SILAR） system. The grown nano-bulk junction exhibits Schottky diode behavior. The response of the nano-bulk junction was investigated under oxygen and hydrogen atmospheric condi- tions. The gas response ratio was found to be 198% for Oxygen and 34% for Hydrogen at room temperature. An increase in the operating temperature of the nano-bulk junction resulted in a decrease in their gas response ratio. A logarithmic dependence on the oxygen partial pressure to the junction response was observed, indicating a Temkin isothermal behavior. Work function measurements using a Kelvin probe demonstrate that the exposure to an oxy- gen atmosphere fails to effectively separate the charges due to the built-in electric field at the interface. Based on the benefits like simple structure, ease of fabrication and response ratio the studied device is a promising candidate for gas detection applications.
