1. Article overview

Self-powered sensors are essential in the field of wearable devices and the Internet of Things. This paper reports an accordion-like MXene/MOF copper oxide (CuO) gas sensor driven by a latex and PTFE-based friction nanogenerator (TENG) for detecting ammonia (NH3) at room temperature. (1) The peak-to-peak value of the open circuit voltage and short-circuit current generated by the prepared TENG can reach 810V and 34μA, respectively. The maximum peak power density that TENG can support is 10.84W/m2, and it can light up at least 480 LEDs. (2) In addition, it is demonstrated that the flexible TENG in the single-electrode working mode can stimulate human movement, which has great potential in wearable devices. The self-powered NH3 sensor driven by TENG has excellent response at room temperature (Vg/Va=24.8@100ppm) and has great potential in monitoring pork quality. (3) MXene and CuO were characterized by SEM, TEM, EDS, XRD and XPS to analyze the properties of the material. The NH3 sensing performance of the self-powered sensor based on MXene/CuO is greatly improved, and the mechanism of enhancing the sensing performance is systematically discussed.




Two, graphic guide







Figure 1. (a) Schematic diagram of a self-powered NH3 sensor driven by TENG.

(B) TENGs working mechanism.

(C) COMSOL simulation results of potential distribution in TENG at different intervals.







Figure 2. (a) TENG lights up the letters "UPC" and "TENG" composed of 221 LEDs connected in series.

(B) Voltage curve of different capacitors.

(C) TENG supplies power to the low-power pedometer.

(D) Schematic diagram of elastic TENG.

(E) The working mechanism of flexible TENG based on single electrode working mode.

(F) Voltage output of flexible TENG under different bending angles.

Flexible TENG is used for motion detection in various parts of the human body: (g) feet, (h) elbows and (i) stomach.





Figure 3. (a) Dynamic resistance changes of MXene/CuO sensors exposed to various NH3 gas concentrations.

(B) The response of three types of sensors prepared by MXene, CuO and MXene/CuO.

(C) The composite structure of MXene and CuO.

(D) CuO NH3 response mechanism.

(E) Schematic diagram of MXene structure with different functional groups.

(F) Schematic diagram of possible NH3 sensing mechanism of MXene.







Figure 4. The output voltage of (a) MXene, (b) CuO and (c) MXene/CuO thin film sensors driven by TENG, which are exposed to a wide range of NH3 concentrations (0-100 ppm).

(D) Fitting curve of response concentration of three prepared sensors.

(E) The MXene/CuO composite sensor alternately repeats three cycles in the air and under 100ppm NH3.

(F) Response and recovery time of self-powered MXene/CuO sensors.

(G) The selectivity of self-powered MXene/CuO sensors.

(H) Long-term stability of self-powered MXene/CuO sensors.

(I) Measurement results of NH3 concentration released by 20 grams of pork stored for different storage times at room temperature.





3. Thesis information



Multifunctional Latex/Polytetrafluoroethylene-Based Triboelectric Nanogenerator for Self-Powered Organ-like MXene/Metal–Organic Framework-Derived CuO Nanohybrid Ammonia Sensor

ACS Nano (IF=14.588)

Pub Date: 2021-02-07

DOI: 10.1021/acsnano.0c09015

Dongyue Wang; Dongzhi Zhang; Yan Yang; Qian Mi; Jianhua Zhang; Liandong Yu

Correspondence Unit: School of Control Science and Engineering, China University of Petroleum (East China), Qingdao 266580