A Patterned Graphene/ZnO UV Sensor Driven by Integrated Asymmetric Micro‐Supercapacitors on a Liquid Metal Patterned Foldable Paper

Abstract

A foldable array of patterned graphene/ZnO nanoparticle UV sensor and asymmetric micro‐supercapacitors (AMSCs) integrated on a paper substrate with patterned liquid metal interconnections is reported. The resistor type UV sensor based on graphene/ZnO nanoparticles is patterned to be driven by the stored energy of the integrated AMSCs. The AMSC consists of MnO2 nanoball deposited multiwalled carbon nanotubes (MWNTs) and V2O5 wrapped MWNTs as positive and negative electrodes, respectively. As an electrolyte, propylene carbonate‐poly(methyl methacrylate)‐LiClO4, an organic solvent‐based gel, is used. The UV sensor and AMSCs can be easily integrated on a liquid metal, Galinstan, patterned, waterproof mineral paper and show a mechanically stable UV sensing, regardless of repetitive folding cycles. This work demonstrates a novel foldable nanomaterial based sensor system driven by integrated energy storage devices, applicable to future wearable and portable electronics.

A high operating voltage micro-supercapacitor based on the interlamellar modulation type Ti3C2Tx MXene

“…The Ragone plot for different MSCs to compare the energy density is shown in figure 5(c). The MM-50-based MSC has an energy density of 21.5 μWh cm −2 at a power density of 0.154 mW cm −2 and an energy density of 8.3 μWh cm −2 at the power density of 1.2 mW cm −2 , which are comparable or superior to those of recently reported MSCs within ionic liquid electrolytes, such as Mn/Mo@MWCNTbased MSCs within an ADN/SN/LiTFSI/PMMA electrolyte [29], MnO 2 /MWNT//VWMWNT-based asymmetric MSCs within a PMMA-PC-LiClO 4 electrolyte [30], SiC@C-based MSCs within an EMIMNTF 2 electrolyte [31] and LIG-based MSCs within EMIMNTF 2 electrolyte [32]. Besides, compared with other Ti 3 C 2 T x -based MSCs, the energy density in high-voltage MM-50-based MSC is superior to the asymmetric MSC based on Ti 3 C 2 T x //MnO 2 /PPy in PVA/H 2 SO 4 electrolyte [33], 3D MSC consisting of Ti 3 C 2 T x −rGO composite aerogel electrode and PVA/H 2 SO 4 electrolyte [34], asymmetric Ti 3 C 2 T x //Co-Al LDH in 6M KOH electrolyte [35].…”

Semi-liquid metal and adhesion-selection enabled rolling and transfer (SMART) printing: A general method towards fast fabrication of flexible electronics

“…The previous studies have shown that the Ni-EGaIn surface is covered with gallium oxide layer in air [43,44], and the adhesion between two surfaces is generally dependent on the chemical interaction and the morphological microstructures of the surface [45]. In this paper, we tested the surface composition of the Ni-EGaIn using XPS and the results clearly demonstrated the presence of Ga 2 O 3 on the surface of the Ni-EGaIn (Fig.…”

A Real‐Time Wearable UV‐Radiation Monitor based on a High‐Performance p‐CuZnS/n‐TiO2 Photodetector

“…Thus, the relatively long trapping time and short transit time leads to a high gain. In addition, an ultrahigh and stable photocurrent of ≈4 mA at 3 V is observed (see Figure b), exceeding that of most PDs reported in literature (see details in Table S2, Supporting Information), which suggests that it can be easily integrated with a commercial data reader and a wireless data transporter that typically require a threshold current of ≈ 1 mA. The correlation between photocurrent and power density of such device was also calculated, as indicated in Figure c.…”