Responsive Zwitterionic Polymers with Humidity and Voltage Dual-Switching for Multilevel Date Encryption and Anticounterfeiting

Abstract

Data encryption, protection, and anticounterfeiting are crucial in the modern information society. Though a number of technologies have been developed, data security is still facing severe challenges. Herein, a fundamental new approach capable of multilevel data encryption, protection, and anticounterfeiting is developed based on the responsive zwitterionic polymers named as p o l y ( p e n t a fl u o r o p h e n y l a c r y l a t e )c o -p o l y [ ( 3 -( ( 3acrylamidopropyl)dimethylammonio)propane-1-sulfonate)] (pPFPA-co-pADPS). Detailed studies reveal that zwitterionic polymers exhibit drastic electrical property changes to humidity variation. By reliance of this feature, highly secure touchless palmbased biometric authentication is realized; further, field-effect transistors (FETs) using zwitterionic polymers as dielectrics show nonvolatile memory behaviors with good reliability and rewrite-ability. Remarkably, not only appropriate voltages but also specific humidity range are required to safely decrypt the stored message. In addition, the memory gains the ability to destroy the stored data under counterfeiting/hacking condition, thus preventing the data from being stolen by repeated trials. Therefore, a high level of data security is realized. This work provides new insights into zwitterionic copolymer dielectric based OFETs, demonstrates the first example of double-stage data encryption and protection by OFET memory, and opens up new opportunities for data-securing by responsive materials.

Rigidity‐Tuned Full‐Color Emission: Uncommon Luminescence Change from Polymer Free‐Volume Variations

“…As illustrated, both dipole–dipole and polar–π interactions should dominate the PTFs/pPFPA interaction due to the presence of phenanthridine units, large size of π‐conjugation, and polar pentafluorophenyl segments (19.95 Debye). [ 32,33 ] Indeed, we observe a pronounced co‐assemble behavior between PTF1 and pPFPA in THF/toluene. As shown in Figure a, bright‐yellow fluorescent solids gradually precipitate out, accompanied by the more and more transparent and less emissive top layer solution.…”

A Camel Nose-Inspired Highly Durable Neuromorphic Humidity Sensor with Water Source Locating Capability

“…A porous structure not only significantly accelerates the diffusion but also substantially enlarges the contact surface area. Zwitterions can boost the interaction between water molecules and devices due to their prominent hygroscopic features stemming from a high concentration of cations and anions, 27 as confirmed experimentally and theoretically (vide infra). Therefore, a porous zwitterionic film could promote both contact and interaction processes and regulate the moisture adsorption and desorption kinetics, thus leading to different response and recovery processes and, in turn, different synaptic behaviors.…”

“…This result is consistent with that of our previous study. 27 Notably, at z = 38, the porous film (F 120 E 32 M 38 -PA) exhibits a higher saturate capacitance (>1300 nF cm −2 ) and an improved response speed of which the response and the recovery times reduce to 13.6 and 32.3 s (Figure 5b), respectively. This rate is more than 4 times higher than that of the nonporous film F 120 E 32 M 0 -PA. Further increasing z results in an even higher saturated capacitance (up to 1700 nF cm −2 ) and faster response speeds (as low as 10 s).…”

“…The subsequent aminolysis of the porous film with ADPS thoroughly converts pPFPA to pADPS, as evidenced by the appearance of new peaks at 3380 and 1652 cm −1 assigned to amide N−H and CO stretching and at 1290 and 1170 cm −1 assigned to SO stretching along with a loss of the peak at 1782 cm −1 assigned to phenyl ester CO stretching in ATR measurements of F 120 E 32 M 152 -P and F 120 E 32 M 152 -PA (Figure 2d,e). 27 Note that, when a low cross-linker (bPEI) content is used (i.e., F 120 E 16 M 136 ), a poorly cross-linked network is formed with over 90% film thickness reduction after a chloroform etching. A high cross-linker (bPEI) content (i.e., F 120 E 48 M 168 ) may lead to an overly cross-linked and less elastic network, thus leaving insufficient reactive sites for the following ADPS decoration.…”

An artificial light-harvesting system with sequential energy transfer for information dual encryption and anticounterfeiting

“…Information encryption and anticounterfeiting are very important in modern society. Chemical-based information encryption and anticounterfeiting strategies have been widely used for fighting against decrypting and counterfeiting, 1 such as fluorescencebased information encryption and anticounterfeiting, [2][3][4][5][6] phosphorescence-based information encryption and anticounterfeiting, [7][8][9] thermally controlled encryption, 10 humidity and voltage controlled multilevel information encryption and anticounterfeiting, 11,12 etc. Among these strategies, encrypting and anticounterfeiting technologies based on tunable fluorescence emission have attracted much interest for fast response, visualization and good concealment properties.…”