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首页二维MoS2驱动的Wi-Fi频段柔性能量采集器
二维MoS2驱动的Wi-Fi频段柔性能量采集器
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更新于2024-07-17
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本文主要探讨了柔性WiFi无线充电领域的创新突破,通过将超快速的二维材料MoS2(二硫化钼)与灵活的Wi-Fi频段天线集成,研发出一款全柔性且集成的整流器-天线系统。这一设计实现了在Wi-Fi频段无电池状态下进行电磁辐射的无线能量采集,即零外部偏置的无线供电技术。同时,MoS2整流器作为柔性混频器,能够在10吉赫兹以上的频率范围内实现频率转换,展现出其在高频信号处理中的卓越性能。 二维材料如MoS2的独特机械和电子特性使其成为柔性电子设备的理想选择,如智能皮肤,能够将日常物体转化为分布式的传感器网络。然而,构建一个高效、灵活且持续工作的能源收集解决方案,对于自主供电系统至关重要,这一点在这项研究中得到了解决。传统的分布式电子系统虽然已包含许多基于二维材料的组件,如晶体管、传感器和存储设备,但无线能量传输方面的短板一直是制约其广泛应用的瓶颈。 通过将MoS2的优异电导率和宽频谱响应与柔性天线结合,研究人员创造了一个通用的能源收集模块,它能够无缝融入各种柔性电子系统中,比如可穿戴设备、物联网设备等,进一步推动了无线通信和能源自给自足设备的发展。这项工作不仅提高了无线充电的便利性,还可能开启一种全新的能源获取方式,对绿色能源和物联网技术的进步具有重要意义。 此外,文章指出该研究成果发表于《自然》杂志,强调了知识产权归属,并且引用了DOI:10.1038/s41586-019-0892-1,表明这是一项经过同行评审的科学贡献。这项工作的成功,预示着二维材料在未来柔性电子器件和能源管理领域的广阔应用前景,有望促进相关技术的商业化进程。
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LetterreSeArCH
© 2019 Springer Nature Limited. All rights reserved.
in Extended Data Fig.6c, d. To test the entire harvesting system, we
approached a commercial Wi-Fi-band transmitter antenna (powered
by a signal generator with input power of about 2mW) to the inte-
grated MoS
2
rectenna. The flexible MoS
2
rectenna was successful in
wirelessly harvesting the RF power in the Wi-Fi channel (5.9GHz)
and generated a rectified output voltage of up to 250mV (distance
from transmitter antenna, about 2.5cm). With the demonstrated cutoff
frequency (10GHz) fully covering the Wi-Fi band, our phase-engi-
neered MoS
2
Schottky diode enabled the experimental demonstration
of a fully flexible rectenna operating as a Wi-Fi-band RF energy har-
vester (IEEE 802.11 standards). The complete flexibility of the MoS
2
rectenna is a critical advantage compared with rigid-diode technolo-
gies because it could enable the development of electronics with form
factors that allow seamless integration with objects of arbitrary shapes.
Fig. 3 | MoS
2
phase-junction rectenna as a wireless RF energy harvester.
a, Output voltage as a function of the input RFpower delivered to the
device at four different frequencies (2.4GHz, 5.9GHz, 10GHz and
15GHz). The corresponding circuit diagram is shown in Extended Data
Fig.5a. b, Power efficiency of MoS
2
rectifiers as a function of input power
in the Wi-Fi band. c, Output voltage as a function of frequency of the
input signal for RF power P
RF
=5mW. d, Illustration of a flexible rectifier
based on a MoS
2
phase junction, integrated with a flexible Wi-Fi band
antenna for wireless energy harvesting. The Wi-Fi-band a.c. signal from
the antenna is rectified into a d.c. signal by the MoS
2
rectifier. Shown are
the illustrativeI–t curves corresponding to the a.c. and d.c. currents (blue
and red arrow, respectively). e, Photograph of a MoS
2
rectenna on Kapton.
The right panel shows a zoom-in of the region of the MoS
2
rectifier. Scale
bar, 100μm.
Antenna
metal
Antenna
metal
MoS
2
diode
e
Wi-Fi bands
a
b
c
0.1110
Frequency (GHz)
Antenna
Wi-Fi band
radiation
Load
t
I
G
G
d
–20 –15 –10 –5 0510 –20 –15 –10 –5 0510
0
1
2
3
2.4 GHz
5.9 GHz
10 GHz
15 GHz
V
out
(V)
V
out
(mV)
P
RF
(dBm)
0
10
20
30
40
P
RF
(dBm)
2.4 GHz
5.9 GHz
Power efciency (%)
f
c
= 10 GHz
t
I
10
1
10
2
10
3
10
4
MoS
2
2H–1T
phase junction
Fig. 4 | Demonstration of the MoS
2
-based mixer operating in the
gigahertz range. The output signals are measured by a spectrum analyser
(Keysight N9020A) with an input impedance of 50Ω. a, Frequency
conversion by an RF mixer with two inputs: an RF signal with frequency
f
RF
and a local oscillator signal with frequency f
LO
. A signal with
frequencies f
IF
=f
RF
±
f
LO
can be generated at the output of the RF mixer.
b, Experimental demonstration of frequency conversion by a MoS
2
-based
gigahertz mixer. The RF and local oscillator frequencies are f
RF
=10.4GHz
and f
LO
=8GHz, respectively. The downconverted and upconverted
intermediate frequencies are f
IF
=2.4GHz and f
IF
=18.4GHz,
respectively. c, Frequency conversion by a MoS
2
-based gigahertz mixer.
The RF and local oscillator frequencies are f
RF
=1.4GHz and f
LO
=1GHz,
respectively. The downconverted and upconverted intermediate
frequencies are f
IF
=0.4GHz and f
IF
=2.4GHz, respectively.
bca
Mixing
Pd Au
2H MoS
2
1T/1T′ MoS
2
–60
510
Power (dBm)
Power (dBm)
Frequency (GHz)Frequency (GHz)
15 20 25 0.51.0 1.52.0 2.5
–40
–20
0
–60
–80
–40
–20
0
I
tt
t
t
I
I
I
f
LO
= 8 GHz
f
LO
= 1 GHz
f
RF
= 10.4 GHz
f
RF
= 1.4 GHz
f
RF
– f
LO
=
2.4 GHz
f
RF
– f
LO
=
0.4 GHz
f
RF
+ f
LO
= 18.4 GHz
f
RF
+ f
LO
= 2.4 GHz
Radiofrequency (f
RF
)
Local oscillator (f
LO
)
Downconversion
f
RF
– f
LO
Upconversion
f
RF
+ f
LO
NATURE| www.nature.com/nature
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