Publications by authors named "Peter M Knapp"
The electrical double layer (EDL), consisting of two parallel layers of opposite charges, is foundational to many interfacial phenomena and unique in atomically thin materials. An important but unanswered question is how the "transparency" of atomically thin materials to their substrates influences the formation of the EDL. Here, we report that the EDL of graphene is directly affected by the surface energy of the underlying substrates.
View Article and Find Full Text PDFA stretchable photodetector with enhanced, strain-tunable photoresponsivity is developed based on crumpled graphene by engineering 2D graphene into 3D structures. This crumpled graphene photodetector demonstrates ≈400% enhanced photoresponsivity led by an order-of-magnitude enhanced extinction of graphene and 100% modulation in photoresponsivity with 200% applied strain. Finally, strain-tunable, wavelength-selective photodetection is shown by integrated colloidal photonic crystals-crumpled graphene photodetector devices.
View Article and Find Full Text PDFPurpose: Perioperative instillation of intravesical chemotherapy after bladder tumor resection is supported by level I evidence showing a 30% decrease in tumor recurrence. However, studies of administrative data sets show poor use in practice.
Materials And Methods: We prospectively evaluated the use of perioperative intravesical chemotherapy in a multipractice quality improvement collaborative.
Purpose: Despite its established efficacy in reducing recurrence rates for patients with urothelial carcinoma, immediate intravesical chemotherapy is reportedly used infrequently. Accordingly, the Urological Surgery Quality Collaborative implemented a project aimed at understanding and improving the use of immediate intravesical chemotherapy.
Materials And Methods: Surgeons in 5 Urological Surgery Quality Collaborative practices prospectively collected clinical and baseline intravesical chemotherapy use data for patients undergoing bladder biopsy or transurethral bladder tumor resection from September 2010 through January 2012.
Purpose: We describe findings from a Urological Surgery Quality Collaborative project focused on improving the use of radiographic staging in men with newly diagnosed prostate cancer.
Materials And Methods: From May 2009 through September 2010 Urological Surgery Quality Collaborative surgeons collected uniform data for men with newly diagnosed prostate cancer. During this period we implemented 3 phases of data collection.
Purpose: We describe the establishment of the Urological Surgery Quality Collaborative including our pilot project to improve radiographic staging for men with prostate cancer.
Materials And Methods: The Urological Surgery Quality Collaborative comprises more than 60 urologists from 3 group practices. From May through September 2009 Urological Surgery Quality Collaborative surgeons collected a uniform set of data (eg prostate specific antigen, clinical stage) for men with newly diagnosed prostate cancer.
Purpose: We evaluate the efficacy and safety of tadalafil, taken as needed, in men with mild to severe erectile dysfunction (ED) and assess sexual intercourse attempt patterns.
Materials And Methods: In this multicenter, double-blind, placebo controlled, parallel study conducted in the United States and Puerto Rico 207 men with ED were randomized to placebo or 20 mg tadalafil for 12 weeks. The primary efficacy variables were changes from baseline in the mean International Index of Erectile Function erectile function domain score and mean per patient percentage of "yes" responses to Sexual Encounter Profile (SEP) diary questions 2 (successful penetration) and 3 (successful intercourse).