Because selleck the reaction initiator can be attached to a variety of detection probes through well-established cross-linking reactions, this technique could a fantastic read be expanded as a universal strategy Inhibitors,Modulators,Libraries for the sensitive detection Inhibitors,Modulators,Libraries of DNA and proteins. We see enormous potential Inhibitors,Modulators,Libraries for this’ new sensing technology in the development of portable DNA/protein sensors for point-of-need applications.”
“In a variety of applications where the electronic and optical characteristics of traditional, siliconbased materials are inadequate, recently researchers have employed semiconductors made Inhibitors,Modulators,Libraries from combinations of group III and V elements such as InAs.
InAs has a narrow band gap and very high electron mobility in the near-surface region, which makes it an attractive material for high performance transistors, optical Inhibitors,Modulators,Libraries applications, and chemical sensing.
However, silicon-based materials remain the top semiconductors of choice for biological applications, in part because of their relatively low toxicity. In contrast to silicon, InAs forms an unstable oxide layer under ambient conditions, which can corrode over time and leach toxic indium and arsenic Inhibitors,Modulators,Libraries components. To make InAs more attractive for biological applications, researchers have investigated passivation, chemical and electronic stabilization, of the surface by adlayer adsorption. Because of the simplicity, low cost, and flexibility in the type of passivating molecule used, many researchers are currently exploring wet-chemical methods of passivation.
This Account summarizes much of the recent work on the chemical passivation of InAs with a particular focus on the Inhibitors,Modulators,Libraries chemical Inhibitors,Modulators,Libraries stability of the surface and prevention of oxide regrowth.
We review the various methods of surface preparation and Inhibitors,Modulators,Libraries discuss Inhibitors,Modulators,Libraries how crystal orientation affects the chemical properties of the surface. The correct etching of InAs is critical as researchers prepare the surface for subsequent adlayer adsorption. HCl etchants combined with a postetch annealing step allow the tuning of the chemical properties in the near-surface region to either arsenic- or indium-rich environments. Bromine etchants create indium-rich surfaces and do not require annealing after etching; however, bromine etchants are harsh and potentially destructive to the surface.
The simultaneous use of NH4OH etchants with passivating molecules prevents contact with ambient air that can occur during sample transfer between solutions.
selleck chemical over at this website The passivation of InAs is dominated by sulfur-based molecules, which form stable In-S bonds on the InAs surface. Both sulfides and alkanethiols form well-defined monolayers on InAs and are dominated by In-S interactions. Sulfur-passivated InAs surfaces prevent regrowth of the surface oxide layer and are more stable in air than unpassivated surfaces.
Although functionalization of InAs with sulfur-based molecules effectively passivates the surface, future sensing applications may require the adsorption of functional biomolecules onto the InAs surface.