Disposable devices designed for single and/or multiple reliable measurements over a short duration have attracted considerable interest recently. However, these devices often use non-recyclable and non-biodegradable m...Disposable devices designed for single and/or multiple reliable measurements over a short duration have attracted considerable interest recently. However, these devices often use non-recyclable and non-biodegradable materials and wasteful fabrication methods. Herein, we present ZnO nanowires(NWs) based degradable high-performance UV photodetectors(PDs) on flexible chitosan substrate. Systematic investigations reveal the presented device exhibits excellent photo response, including high responsivity(55 A/W), superior specific detectivity(4×10^(14) jones), and the highest gain(8.5×10~(10)) among the reported state of the art biodegradable PDs. Further, the presented PDs display excellent mechanical flexibility under wide range of bending conditions and thermal stability in the measured temperature range(5–50 ℃).The biodegradability studies performed on the device, in both deionized(DI) water(pH≈6) and PBS solution(pH=7.4),show fast degradability in DI water(20 mins) as compared to PBS(48 h). These results show the potential the presented approach holds for green and cost-effective fabrication of wearable, and disposable sensing systems with reduced adverse environmental impact.展开更多
Transfer printing of high mobility inorganic nanostructures,using an elastomeric transfer stamp,is a potential route for highperformance printed electronics.Using this method to transfer nanostructures with high yield...Transfer printing of high mobility inorganic nanostructures,using an elastomeric transfer stamp,is a potential route for highperformance printed electronics.Using this method to transfer nanostructures with high yield,uniformity and excellent registration over large area remain a challenge.Herein,we present the‘direct roll transfer’as a single-step process,i.e.,without using any elastomeric stamp,to print nanoribbons(NRs)on different substrates with excellent registration(retaining spacing,orientation,etc.)and transfer yield(∼95%).The silicon NR based field-effect transistors printed using direct roll transfer consistently show high performance i.e.,high on-state current(Ion)>1 mA,high mobility(μ_(eff))>600 cm^(2)/Vs,high on/off ratio(I_(on)/_(off))of around 10^(6),and low hysteresis(<0.4 V).The developed versatile and transformative method can also print nanostructures based on other materials such as GaAs and thus could pave the way for direct printing of high-performance electronics on large-area flexible substrates.展开更多
基金supported in part by Engineering and Physical Science Research Council (EPSRC) through Engineering Fellowship (EP/R029644/1)Hetero-print Programme Grant (EP/R03480X/1)European Commission through grant references (H2020-MSCAITN2019-861166)。
文摘Disposable devices designed for single and/or multiple reliable measurements over a short duration have attracted considerable interest recently. However, these devices often use non-recyclable and non-biodegradable materials and wasteful fabrication methods. Herein, we present ZnO nanowires(NWs) based degradable high-performance UV photodetectors(PDs) on flexible chitosan substrate. Systematic investigations reveal the presented device exhibits excellent photo response, including high responsivity(55 A/W), superior specific detectivity(4×10^(14) jones), and the highest gain(8.5×10~(10)) among the reported state of the art biodegradable PDs. Further, the presented PDs display excellent mechanical flexibility under wide range of bending conditions and thermal stability in the measured temperature range(5–50 ℃).The biodegradability studies performed on the device, in both deionized(DI) water(pH≈6) and PBS solution(pH=7.4),show fast degradability in DI water(20 mins) as compared to PBS(48 h). These results show the potential the presented approach holds for green and cost-effective fabrication of wearable, and disposable sensing systems with reduced adverse environmental impact.
基金supported in part by Engineering and Physical Sciences Research Council(EPSRC)through Engineering Fellowship for Growth(EP/R029644/1)Heteroprint Programme Grant(EP/R03480X/1).
文摘Transfer printing of high mobility inorganic nanostructures,using an elastomeric transfer stamp,is a potential route for highperformance printed electronics.Using this method to transfer nanostructures with high yield,uniformity and excellent registration over large area remain a challenge.Herein,we present the‘direct roll transfer’as a single-step process,i.e.,without using any elastomeric stamp,to print nanoribbons(NRs)on different substrates with excellent registration(retaining spacing,orientation,etc.)and transfer yield(∼95%).The silicon NR based field-effect transistors printed using direct roll transfer consistently show high performance i.e.,high on-state current(Ion)>1 mA,high mobility(μ_(eff))>600 cm^(2)/Vs,high on/off ratio(I_(on)/_(off))of around 10^(6),and low hysteresis(<0.4 V).The developed versatile and transformative method can also print nanostructures based on other materials such as GaAs and thus could pave the way for direct printing of high-performance electronics on large-area flexible substrates.
