Characterization of PEDOT:PSS Nanofilms Printed via Electrically Assisted Direct Ink Deposition with Ultrasonic Vibrations.

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) has emerged as a promising conductive polymer for constructing efficient hole-transport layers (HTLs) in perovskite solar cells (PSCs). However, conventional fabrication methods, such as spin coating, spray coating, and slot-die coating, have resulted in PEDOT:PSS nanofilms with limited performance, characterized by a low density and non-uniform nanostructures. We introduce a novel 3D-printing approach called electrically assisted direct ink deposition with ultrasonic vibrations (EF-DID-UV) to overcome these challenges. This innovative printing method combines programmable acoustic field modulation with electrohydrodynamic spraying, providing a powerful tool for controlling the PEDOT:PSS nanofilm's morphology precisely. The experimental findings indicate that when PEDOT:PSS nanofilms are crafted using horizontal ultrasonic vibrations, they demonstrate a uniform dispersion of PEDOT:PSS nanoparticles, setting them apart from instances involving vertical ultrasonic vibrations, both prior to and after the printing process. In particular, when horizontal ultrasonic vibrations are applied at a low amplitude (0.15 A) during printing, these nanofilms showcase exceptional wettability performance, with a contact angle of 16.24°, and impressive electrical conductivity of 2092 Ω/square. Given its ability to yield high-performance PEDOT:PSS nanofilms with precisely controlled nanostructures, this approach holds great promise for a wide range of nanotechnological applications, including the production of solar cells, wearable sensors, and actuators.

Ultrafast and Large-Scale Fabrication of PEDOT:PSS Nanofilms Using Electrical-Field-Assisted Direct Ink Deposition.

The importance of conductive polymers has significantly increased over the decade due to their various applications, such as in electronic devices, sensors, and photovoltaics. Poly(3,4-ethylene dioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successfully and widely used polymers in practical applications. Spin coating is extensively used to fabricate these conductive films; however, it has disadvantages. It is inherently a batch process with relatively low output and high solution wastage. To address these issues, we developed a novel printing process called electrical-field-assisted direct ink deposition (EF-DID), which yields a continuous, homogenous film with high electrical conductivity. In this process, we studied the formation of nanodroplets under an electrical field and their effects on film characteristics. Furthermore, dimethyl sulfoxide (DMSO) was considered as an additive solvent to increase the conductivity and wettability of the films. We then compared EF-DID-printed PEDOT:PSS films with spin-coated films to better understand the film properties. Finally, inverted perovskite solar cell devices were fabricated and compared, where the PEDOT:PSS layers were prepared by EF-DID printing and spin coating. Based on the experimental results, a solution of 20% PEDOT:PSS in DMSO (vol/vol) printed by EF-DID for 15 s provided optimal morphology.

Using CBPR to Extend Prostate Cancer Education, Counseling, and Screening Opportunities to Urban-Dwelling African-Americans.

Community-based participatory research (CBPR) is becoming one of the dominant approaches for bringing evidence- and consensus-based cancer prevention and control practices to medically underserved communities. There are many examples of how CBPR has been useful for generating culturally specific solutions for different health issues that affect African-Americans. However, few examples exist in the literature on how the CBPR approach can be applied to address prostate cancer. This paper describes a collaborative process for linking inner-city, African-American men to free prostate cancer education, physician counseling, and screening opportunities (prostate-specific antigen (PSA) testing and digital rectal examination (DRE)). The site of this community-based participatory project was the city of Buffalo, located in Erie County, New York. The collaborative, community-academic process that is described includes the following: (1) planning and conducting a community needs assessment to contextualize local prostate cancer issues, (2) organizing town and gown event planning, and (3) manipulating aspects of the built environment to build an infrastructure within the community to address disparities in screening opportunities. This paper concludes with a description of lessons learned that can help others develop and implement similar activities in other communities.

Secondhand smoke and particulate matter exposure in the home.

With the increasing normative trend of clean indoor air laws prohibiting smoking in public places such as worksites and restaurants, the home is becoming the primary source of secondhand smoke (SHS) exposure. However, little empirical data indicate how SHS is distributed throughout homes and whether smoking in segregated areas offers protection. This project studied real-time data on levels of SHS in 9 homes in which smoking was permitted and in 3 smoke-free homes. Active sampling monitors were used to assess levels of PM(2.5), a marker for SHS, over a 3-day period. In smoking homes, one monitor was placed in the primary smoking area and another in a distal location, where smoking generally did not occur. Participants logged smoking and other activities that could affect air quality. In smoking homes, without assuming normality, the mean PM(2.5) level for the primary smoking areas was statistically significantly higher than that for distal areas (84 and 63 microg/m3, respectively). Both levels far surpassed the U.S. Environmental Protection Agency's annual standard of 15 microg/m3 for outdoor air quality. By contrast, the smoke-free home mean was 9 microg/m3, similar to outdoor air quality. These results suggest that the air in smoking homes was several times more polluted than that in smoke-free homes, regardless of where the measurements were taken, meaning that efforts to confine smoking to only part of the home offer no protection for people anywhere inside the home. Household members can be protected by implementing a smoke-free home policy.

Photocurrent enhancements of organic solar cells by altering dewetting of plasmonic Ag nanoparticles.

Incorporation of metal nanoparticles into active layers of organic solar cells is one of the promising light trapping approaches. The size of metal nanoparticles is one of key factors to strong light trapping, and the size of thermally evaporated metal nanoparticles can be tuned by either post heat treatment or surface modification of substrates. We deposited Ag nanoparticles on ITO by varying nominal thicknesses, and post annealing was carried out to increase their size in radius. PEDOT: PSS was employed onto the ITO substrates as a buffer layer to alter the dewetting behavior of Ag nanoparticles. The size of Ag nanoparticles on PEDOT: PSS were dramatically increased by more than three times compared to those on the ITO substrates. Organic solar cells were fabricated on the ITO and PEDOT: PSS coated ITO substrates with incorporation of those Ag nanoparticles, and their performances were compared. The photocurrents of the cells with the active layers on PEDOT: PSS with an optimal choice of the Ag nanoparticles were greatly enhanced whereas the Ag nanoparticles on the ITO substrates did not lead to the photocurrent enhancements. The origin of the photocurrent enhancements with introducing the Ag nanoparticles on PEDOT: PSS are discussed.

Internet cigarette purchasing among 9th grade students in western New York: 2000-2001 vs. 2004-2005.

OBJECTIVE: To assess trends and correlates of youth cigarette purchasing behavior on the Internet. METHODS: In 2000-2001, Roswell Park Cancer Institute conducted a survey asking 7,019 ninth grade students in Erie and Niagara Counties in New York State about their tobacco use and purchasing habits, including use of the Internet to buy cigarettes. The 2004-2005 survey is a replication of the 2000-2001 survey. Both surveys used an anonymous, self-administered questionnaire survey. These data were combined in order to examine trends in youth smoking behavior. RESULTS: Students surveyed in 2004-2005 were 2.6 times more likely (95% CI: 1.5, 4.6) to have purchased cigarettes over the Internet in the 30 days prior to the survey than those surveyed in 2001 (5.2% to 1.6%); however, the intention to use the Internet as a cigarette source in the future did not change between survey periods. CONCLUSION: Youth online cigarette purchasing has increased but intention to use the Internet to purchase cigarettes in the future has remained the same, suggesting that this trend may be reaching a plateau. Recent public efforts to reduce online cigarette sales will need to be evaluated in order to determine which policy or combination of policies are most effective.

Concurrent quit & win and nicotine replacement therapy voucher giveaway programs: participant characteristics and predictors of smoking abstinence.

This study compares the participant characteristics, program costs, and outcomes of a Quit & Win contest and a nicotine replacement therapy (NRT) voucher giveaway promotion. Both programs were conducted simultaneously so that smokers could enroll in either one program alone (n = 849 and 690, respectively) or both programs (Combination group; n = 230). A follow-up telephone survey of a random sample of participants was conducted 4 to 7 months after enrollment to evaluate smoking status. At enrollment, participants in the three groups were comparable on most smoking and demographic variables, although Quit & Win participants were, on average, younger than those who signed up to get the NRT voucher. Compared with the characteristics of smokers in the region, those who enrolled in the intervention programs were heavier smokers and had more years of formal education. At follow-up, the self-reported quit rates were similar across the three intervention groups, ranging between 25 percent and 30 percent. The only evidence for a higher quit rate among those in the Combination group was among younger smokers. On a simple estimated cost per quit basis, the Quit & Win (130 dollars) and NRT (179 dollars) voucher interventions appear roughly comparable. In all groups, abstinence rates were higher among lighter smokers (<21 cigarettes per day), participants who did not live with another smoker, and those who were married. Both the Quit & Win and NRT voucher giveaway programs were effective in recruiting smokers to make a quit attempt, although combining both interventions did not generally increase abstinence rates.

Access to low-taxed cigarettes deters smoking cessation attempts.

We examined whether smokers who purchased low-taxed cigarettes from American Indian reservations had lower quit attempt and cessation rates than did smokers who purchased cigarettes from full-price outlets. Smokers who bought cigarettes from American Indian reservations were half as likely to make a quit attempt and had a nonsignificant trend toward lower cessation rates (20% vs 10%) compared with those who bought full-priced cigarettes. Interventions that reduce price differentials are suggested to maximize the public health benefit of cigarette excise taxes.

Avoidance of smoky establishments: findings from Erie and Niagara Counties in New York.

The objective of this study was to determine the extent to which people avoid smoky restaurants, bars, bowling alleys, casinos, and bingo halls because of secondhand smoke. Data were collected with telephone interviews of a sample of 1,548 randomly selected adults in Erie and Niagara Counties between October 2002 and March 2003. Most nonsmokers (71%) reported that they are bothered by secondhand smoke. Thirty-four percent of nonsmokers and 10% of smokers responded that they had avoided patronizing a smoky establishment in the past 12 months. The places that were most often avoided were restaurants (17%), bars or taverns (13%), and bingo halls (9%).