Nanoporous gold peel-and-stick biosensors created with etching inkjet maskless lithography for electrochemical pesticide monitoring with microfluidics

Abstract

Flexible nanoporous gold and silver leaf are patterned without photolithography and adhered to microfluidics to create disposable multiplexed electrochemical biosensors.

Ultrathin and Ultrasensitive Printed Carbon Nanotube-Based Temperature Sensors Capable of Repeated Uses on Surfaces of Widely Varying Curvatures and Wettabilities

“…These three salient features, coupled with the ease of fabricating (using a binder-free, nontoxic CNT-GO ink) and integrating these sensors, ensure that this study develops one of the most facile, inexpensive, simple, and environmentally friendly strategies for fabricating ultrathin and ultrasensitive printed temperature sensors that are capable of repeated use on surfaces of widely varying curvatures and wettabilities. We shall like to point out here that our proposed method is similar to these examples of "peel and stick" thin-film sensors that have been extensively used in different applications ranging from building energy management, 32 biosensors to detect organophosphates, 33 and sensors used in internet-of-things (IoT) applications. 34 The present study adopts such a widely used "peel-and-stick" concept to additively fabricate ultrathin (of only a few micrometers thick), ultrasensitive temperature sensors (showing extremely high TCR values for low-temperature ranges), which, by the virtue of its "stick" capabilities, could be easily integrated on the surface of various curvatures and wettabilities.…”

Electrochemical Strategy for Low-Cost Viral Detection

“…Although pure gold leaf has been reported for use in electrodes, , these electrodes have not been surface-modified for biosensing purposes. Alloyed gold leaf that contains a blend of gold and silver has been used to make functionalized nanoporous gold electrodes. − However, the fabrication of these electrodes requires chemical etching of the silver, necessitating a harsh chemical treatment that must be performed in a fume hood and specialized chemical disposal and electrical equipment. To our knowledge, this is the first report of an integrated, three-electrode device constructed from pure gold leaf and the first report of pure gold leaf being used for biosensing purposes.…”

Engineering the surface morphology of inkjet printed Ag by controlling solvent evaporation during plasma conversion of AgNO3 inks

“…Printed sensors and electronics are now ubiquitous in healthcare, consumer goods, environmental monitoring and other economically important areas because of their low cost, disposability, reduced materials wastage, and ease of manufacture. [1][2][3][4][5][6] For electrochemical sensor applications, printed metal electrodes made from silver (Ag) and gold (Au) are commonly used due to their electrical conductivity, mechanical stability, and tunable surface chemistry. 7,8 To broaden the range of detectable chemical or biochemical analytes, efforts have been aimed at functionalizing the electrodes with oxides, 9 carbon materials, 10 polymers, 11 and biomolecules, 12 as well as expanding the number of printable metals, including platinum (Pt), 13 palladium (Pd), 14 and bismuth (Bi).…”